Vulnerability Database

309,103

Total vulnerabilities in the database

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.

  • Published: Sep 27, 2021
  • Updated: Nov 16, 2025
  • CVE: CVE-2021-41095
  • Severity: Low
  • Exploit:

CVSS v3:

  • Severity: Low
  • Score: 4.2
  • AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS v2:

  • Severity: Low
  • Score: 4.3
  • AV:N/AC:M/Au:N/C:N/I:P/A:N

CWEs:

OWASP TOP 10:

Software From Fixed in
discourse / discourse 2.8.0-beta1 2.8.0-beta1.x
discourse / discourse 2.8.0-beta2 2.8.0-beta2.x
discourse / discourse 2.8.0-beta3 2.8.0-beta3.x
discourse / discourse 2.8.0-beta4 2.8.0-beta4.x
discourse / discourse - 2.7.7.x
discourse / discourse 2.8.0-beta5 2.8.0-beta5.x
discourse / discourse 2.8.0-beta6 2.8.0-beta6.x