CVE-2026-53962

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.

• CWE-79

• https://github.com/discourse/discourse/commit/3ee8343cd7f00d59d8513bee0a12e02d50bfc358Patch
• https://github.com/discourse/discourse/commit/810c2715799fd08b06fd6ffc664d9562fe9ea6ffPatch
• https://github.com/discourse/discourse/commit/92a699d89b84685b6fdd63cd0d0e371793c69dadPatch
• https://github.com/discourse/discourse/commit/b8ceb49f4ba52257be30eb3c2ce51a5bf03be5fePatch
• https://github.com/discourse/discourse/releases/tag/v2026.1.5Release Notes
• https://github.com/discourse/discourse/releases/tag/v2026.4.2Release Notes
• https://github.com/discourse/discourse/releases/tag/v2026.5.1Release Notes
• https://github.com/discourse/discourse/releases/tag/v2026.6.0Release Notes
• https://github.com/discourse/discourse/security/advisories/GHSA-jmcf-3367-78vvVendor Advisory

Published

Jul 9, 2026

Last Modified

Jul 14, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

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