Discourse XSS via Unescaped SF Name in Admin Dialog 2026.6.0
CVE-2026-53963 Published on July 9, 2026
Discourse: Stored-XSS in 2FA delete confirmation modal
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.
Vulnerability Analysis
CVE-2026-53963 can be exploited with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-53963 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-53963
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Affected Versions
discourse:- Version >= 2026.1.0-latest, < 2026.1.5 is affected.
- Version >= 2026.4.0-latest, < 2026.4.2 is affected.
- Version >= 2026.5.0-latest, < 2026.5.1 is affected.