PT-2026-56999 · Discourse · Discourse

Published 2026-07-09 · Updated 2026-07-09 · CVE-2026-53962

NVD

CVSS v3.1

5.4

Medium

Base vector

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

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, insufficient SVG sanitization in upload and user avatar handling could lead to cross-site scripting when a user visited specific URLs that are not normally part of community browsing. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-53962

Affected Products

Discourse

References · 10

• https://nvd.nist.gov/vuln/detail/CVE-2026-53962 · Security Note
• https://github.com/discourse/discourse/releases/tag/v2026.6.0 · Note
• https://github.com/discourse/discourse/releases/tag/v2026.4.2 · Note
• https://github.com/discourse/discourse/releases/tag/v2026.1.5 · Note
• https://github.com/discourse/discourse/releases/tag/v2026.5.1 · Note
• https://github.com/discourse/discourse/commit/92a699d89b84685b6fdd63cd0d0e371793c69dad · Note
• https://github.com/discourse/discourse/commit/b8ceb49f4ba52257be30eb3c2ce51a5bf03be5fe · Note
• https://github.com/discourse/discourse/security/advisories/GHSA-jmcf-3367-78vv · Note
• https://github.com/discourse/discourse/commit/810c2715799fd08b06fd6ffc664d9562fe9ea6ff · Note
• https://github.com/discourse/discourse/commit/3ee8343cd7f00d59d8513bee0a12e02d50bfc358 · Note