Less.js Code Review

ISGroup SRL performed an automated Code Review (not a real Static Analysis, more a grep-on-steroid) of this NodeJS project in order to identify potential security vulnerabilities. We do not guarantee that all the findings are valid, and for sure there are plenty of false-positives and false-negatives (undetected issues) but it's free and your project could benefit from this security analisys. The following data is also available in JSON format!

Possible Security Issues

Issue	Description	Line	File
Server Side Injection(SSI) - setTimeout()	User controlled data in 'setTimeout()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	52	test/less-test.js
Server Side Injection(SSI) - setInterval()	User controlled data in 'setInterval()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	127	test/browser/common.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	13	dist/less.min.js
Server Side Injection(SSI) - setInterval()	User controlled data in 'setInterval()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	13	dist/less.min.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	14	dist/less.min.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	15	dist/less.min.js
Server Side Injection(SSI) - new Function()	User controlled data in 'new Function()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	15	dist/less.min.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	16	dist/less.min.js
Server Side Injection(SSI) - setTimeout()	User controlled data in 'setTimeout()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	17	dist/less.min.js
Server Side Injection(SSI) - setInterval()	User controlled data in 'setInterval()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	17	dist/less.min.js
Server Side Injection(SSI) - setInterval()	User controlled data in 'setInterval()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	316	dist/less.js
Server Side Injection(SSI) - setInterval()	User controlled data in 'setInterval()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	706	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	1790	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	2456	dist/less.js
Server Side Injection(SSI) - new Function()	User controlled data in 'new Function()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	5127	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	5460	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	5482	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	5542	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	5567	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	5568	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	5616	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	5925	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	5990	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6224	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6228	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6320	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6376	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6382	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6442	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6560	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6563	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6595	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6729	dist/less.js
Server Side Injection(SSI) - new Function()	User controlled data in 'new Function()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6733	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6747	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6841	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6854	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6994	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7186	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7187	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7213	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7215	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7219	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7221	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7235	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7263	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7269	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7276	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7314	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7339	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7341	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7486	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7487	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7534	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7570	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7617	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7651	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7703	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7752	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7814	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7824	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7839	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7857	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7899	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	7931	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	8507	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	8510	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	8511	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	8686	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	8740	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	8743	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	8772	dist/less.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	8791	dist/less.js
Server Side Injection(SSI) - setTimeout()	User controlled data in 'setTimeout()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	10460	dist/less.js
Server Side Injection(SSI) - setInterval()	User controlled data in 'setInterval()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	10464	dist/less.js
Server Side Injection(SSI) - setTimeout()	User controlled data in 'setTimeout()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	10820	dist/less.js
SSRF - Server Side Request Forgery	User controlled data in 'request()'' can result in Server Side Request Forgery (SSRF).	23	lib/less-node/url-file-manager.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	67	lib/less/transform-tree.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	106	lib/less/import-manager.js
Server Side Injection(SSI) - new Function()	User controlled data in 'new Function()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	25	lib/less/plugins/function-importer.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	31	lib/less/tree/call.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	15	lib/less/tree/assignment.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	44	lib/less/tree/ruleset.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	106	lib/less/tree/ruleset.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	116	lib/less/tree/ruleset.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	131	lib/less/tree/ruleset.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	149	lib/less/tree/ruleset.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	191	lib/less/tree/ruleset.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	223	lib/less/tree/ruleset.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	20	lib/less/tree/js-eval-node.js
Server Side Injection(SSI) - new Function()	User controlled data in 'new Function()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	24	lib/less/tree/js-eval-node.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	38	lib/less/tree/js-eval-node.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	92	lib/less/tree/import.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	95	lib/less/tree/import.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	127	lib/less/tree/import.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	14	lib/less/tree/paren.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	32	lib/less/tree/quoted.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	19	lib/less/tree/detached-ruleset.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	11	lib/less/tree/attribute.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	12	lib/less/tree/attribute.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	25	lib/less/tree/expression.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	31	lib/less/tree/expression.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	18	lib/less/tree/value.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	21	lib/less/tree/value.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	14	lib/less/tree/variable.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	33	lib/less/tree/variable.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	33	lib/less/tree/extend.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	31	lib/less/tree/element.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	22	lib/less/tree/rule.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	56	lib/less/tree/rule.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	11	lib/less/tree/ruleset-call.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	53	lib/less/tree/media.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	66	lib/less/tree/media.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	16	lib/less/tree/operation.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	17	lib/less/tree/operation.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	87	lib/less/tree/selector.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	90	lib/less/tree/selector.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	91	lib/less/tree/selector.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	20	lib/less/tree/url.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	59	lib/less/tree/mixin-call.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	33	lib/less/tree/condition.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	16	lib/less/tree/negative.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	18	lib/less/tree/negative.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	66	lib/less/tree/mixin-definition.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	67	lib/less/tree/mixin-definition.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	93	lib/less/tree/mixin-definition.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	95	lib/less/tree/mixin-definition.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	99	lib/less/tree/mixin-definition.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	101	lib/less/tree/mixin-definition.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	115	lib/less/tree/mixin-definition.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	143	lib/less/tree/mixin-definition.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	149	lib/less/tree/mixin-definition.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	156	lib/less/tree/mixin-definition.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	194	lib/less/tree/mixin-definition.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	71	lib/less/tree/directive.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	75	lib/less/tree/directive.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	13	lib/less/tree/alpha.js
Server Side Injection(SSI) - eval()	User controlled data in eval() can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	6	lib/less/functions/data-uri.js
Server Side Injection(SSI) - setInterval()	User controlled data in 'setInterval()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	159	lib/less-browser/index.js
Server Side Injection(SSI) - setInterval()	User controlled data in 'setInterval()' can result in Server Side Injection (SSI) or Remote Code Execution (RCE).	92	lib/less-browser/error-reporting.js

Issue	Description
Missing Security Header - X-Frame-Options (XFO)	X-Frame-Options (XFO) header provides protection against Clickjacking attacks.
Missing Security Header - Content-Security-Policy (CSP)	Content Security Policy (CSP), a mechanism web applications can use to mitigate a broad class of content injection vulnerabilities, such as cross-site scripting (XSS). CSP Header was not found.
Missing Security Header - Strict-Transport-Security (HSTS)	Strict-Transport-Security (HSTS) header enforces secure (HTTP over SSL/TLS) connections to the server.
Missing 'httpOnly' in Cookie	JavaScript can access Cookies if they are not marked httpOnly.
Infromation Disclosure - X-Powered-By	Remove the X-Powered-By header to prevent information gathering.
Missing Security Header - X-Content-Type-Options	X-Content-Type-Options header prevents Internet Explorer and Google Chrome from MIME-sniffing a response away from the declared content-type.
Missing Security Header - X-Download-Options: noopen	X-Download-Options header set to noopen prevents IE users from directly opening and executing downloads in your site's context.
Missing Security Header - X-XSS-Protection:1	X-XSS-Protection header set to 1 enables the Cross-site scripting (XSS) filter built into most recent web browsers.
Missing Security Header - Public-Key-Pins (HPKP)	Public-Key-Pins (HPKP) ensures that certificate is Pinned.

Node.Security

Security Audit of Less.js