CVE-2021-41095

Discourse is an open source discussion platform. There is a cross-site scripting (XSS) vulnerability in versions 2.7.7 and earlier of the `stable` branch, versions 2.8.0.beta6 and earlier of the `beta` branch, and versions 2.8.0.beta6 and earlier of the `tests-passed` branch. Rendering of some error messages that contain user input can be susceptible to XSS attacks. This vulnerability only affects sites which have blocked watched words that contain HTML tags, modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable`, `beta` and `tests-passed` versions of Discourse. As a workaround, avoid modifying or disabling Discourse’s default Content Security Policy, and blocking watched words containing HTML tags.

• CWE-79
• CWE-79

• https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59Patch, Third Party Advisory
• https://github.com/discourse/discourse/security/advisories/GHSA-qvqx-2h7w-m479Third Party Advisory
• https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59Patch, Third Party Advisory
• https://github.com/discourse/discourse/security/advisories/GHSA-qvqx-2h7w-m479Third Party Advisory

Published

Sep 27, 2021

Last Modified

Jun 17, 2026

Status

Modified

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