CVE-2021-21316

less-openui5 is an npm package which enables building OpenUI5 themes with Less.js. In less-openui5 before version 0.10., when processing theming resources (i.e. `*.less` files) with less-openui5 that originate from an untrusted source, those resources might contain JavaScript code which will be executed in the context of the build process. While this is a feature of the Less.js library it is an unexpected behavior in the context of OpenUI5 and SAPUI5 development. Especially in the context of UI5 Tooling which relies on less-openui5. An attacker might create a library or theme-library containing a custom control or theme, hiding malicious JavaScript code in one of the .less files. Refer to the referenced GHSA-3crj-w4f5-gwh4 for examples. Starting with Less.js version 3.0.0, the Inline JavaScript feature is disabled by default. less-openui5 however currently uses a fork of Less.js v1.6.3. Note that disabling the Inline JavaScript feature in Less.js versions 1.x, still evaluates code has additional double codes around it. We decided to remove the inline JavaScript evaluation feature completely from the code of our Less.js fork. This fix is available in less-openui5 version 0.10.0.

• CWE-74

• http://lesscss.org/usage/#less-options-enable-inline-javascript-deprecated-Third Party Advisory
• https://github.com/SAP/less-openui5/commit/c0d3a8572974a20ea6cee42da11c614a54f100e8Patch, Third Party Advisory
• https://github.com/SAP/less-openui5/releases/tag/v0.10.0Release Notes, Third Party Advisory
• https://github.com/SAP/less-openui5/security/advisories/GHSA-3crj-w4f5-gwh4Third Party Advisory
• https://www.npmjs.com/package/less-openui5Product, Third Party Advisory
• http://lesscss.org/usage/#less-options-enable-inline-javascript-deprecated-Third Party Advisory
• https://github.com/SAP/less-openui5/commit/c0d3a8572974a20ea6cee42da11c614a54f100e8Patch, Third Party Advisory
• https://github.com/SAP/less-openui5/releases/tag/v0.10.0Release Notes, Third Party Advisory
• https://github.com/SAP/less-openui5/security/advisories/GHSA-3crj-w4f5-gwh4Third Party Advisory
• https://www.npmjs.com/package/less-openui5Product, Third Party Advisory

Published

Feb 16, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-21310NextAuth.js (next-auth) is am open source authentication sol…5.9
• CVE-2021-21311Adminer is an open-source database management in a single PH…7.2
• CVE-2021-21312GLPI is open source software which stands for Gestionnaire L…4.8
• CVE-2021-21313GLPI is open source software which stands for Gestionnaire L…6.1
• CVE-2021-21314GLPI is open source software which stands for Gestionnaire L…4.8
• CVE-2021-21315The System Information Library for Node.JS (npm package "sys…7.8
• CVE-2021-21317uap-core in an open-source npm package which contains the co…5.3
• CVE-2021-21318Opencast is a free, open-source platform to support the mana…5.4
• CVE-2021-21319Galette is a membership management web application geared to…5.4
• CVE-2021-21320matrix-react-sdk is an npm package which is a Matrix SDK for…4.3
• CVE-2021-21321fastify-reply-from is an npm package which is a fastify plug…10
• CVE-2021-21322fastify-http-proxy is an npm package which is a fastify plug…9.8