CVE-2026-53963

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a malicious second factor name on an attacker-controlled account was not escaped in the delete confirmation dialog, allowing stored cross-site scripting when an administrator impersonated that account. 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/40de62cddadc65c328a1028ab999f3fa94adbfedPatch
• https://github.com/discourse/discourse/commit/529e17d4d570a48972e7cf64720e5dd1fdf23ca8Patch
• https://github.com/discourse/discourse/commit/d92973e51a46cf6dd20c71e6068e6769b67eea5bPatch
• https://github.com/discourse/discourse/commit/daea5214d833eacbdd3b1a78d99eb14e9cabd915Patch
• 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-wg5x-7f23-m3r5Mitigation, Vendor 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.
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