Vulnerability Monitor

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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

2021-09-27T20:15:07.267

Last Modified

2024-11-21T06:25:27.280

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 4.2 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:P/A:N

  • Access Vector: NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: NONE
  • Integrity Impact: PARTIAL
  • Availability Impact: NONE
Exploitability Score

8.6

Impact Score

2.9

Weaknesses
  • Type: Secondary
    CWE-79
  • Type: Primary
    CWE-79
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application discourse discourse ≤ 2.7.7 Yes
Application discourse discourse 2.8.0 Yes
Application discourse discourse 2.8.0 Yes
Application discourse discourse 2.8.0 Yes
Application discourse discourse 2.8.0 Yes
Application discourse discourse 2.8.0 Yes
Application discourse discourse 2.8.0 Yes
References