PT-2021-23084 · Discourse · Discourse

Nbianca · Published 2021-09-27 · Updated 2024-03-06 · CVE-2021-41095

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Discourse versions 2.7.7 and earlier Discourse versions 2.8.0.beta6 and earlier

Description Discourse is an open source discussion platform. There is a cross-site scripting (XSS) vulnerability in the platform. Rendering of some error messages that contain user input can be susceptible to XSS attacks. This issue only affects sites which have blocked watched words that contain HTML tags, modified or disabled Discourse's default Content Security Policy.

Recommendations For versions 2.7.7 and earlier, update to the latest stable version of Discourse. For versions 2.8.0.beta6 and earlier, update to the latest beta or tests-passed version of Discourse. As a temporary workaround, avoid modifying or disabling Discourse’s default Content Security Policy, and blocking watched words containing HTML tags.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

BIT-DISCOURSE-2021-41095

CVE-2021-41095

GHSA-QVQX-2H7W-M479

Affected Products

Discourse

References · 7

• https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-41095 · Security Note
• https://osv.dev/vulnerability/CVE-2021-41095 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-discourse-2021-41095 · Vendor Advisory
• https://github.com/discourse/discourse/security/advisories/GHSA-qvqx-2h7w-m479 · Note
• https://t.me/cvenotify/21531 · Telegram Post
• https://t.me/cibsecurity/29527 · Telegram Post