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CVE-2026-53963Discourse: 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.
9.0 CRITICALEPSS 0.73%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.0 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
| 7.3 | HIGH | 3.1GitHub_M (CNA) | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N |
Details
- CVE ID
- CVE-2026-53963
- Status
- Analyzed
- Assigner (CNA)
- GitHub_M
- Published
- Jul 9, 2026
- Last modified
- 2026-07-14 02:16 UTC
- Weaknesses
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
As published by the CNA in the CVE record.
discoursediscourse3 version ranges
- >= 2026.1.0-latest, < 2026.1.5
- >= 2026.4.0-latest, < 2026.4.2
- >= 2026.5.0-latest, < 2026.5.1
References
- github.com https://github.com/discourse/discourse/commit/40de62cddadc65c328a1028ab999f3fa94adbfed
- github.com https://github.com/discourse/discourse/commit/529e17d4d570a48972e7cf64720e5dd1fdf23ca8
- github.com https://github.com/discourse/discourse/commit/d92973e51a46cf6dd20c71e6068e6769b67eea5b
- github.com https://github.com/discourse/discourse/commit/daea5214d833eacbdd3b1a78d99eb14e9cabd915
- github.com https://github.com/discourse/discourse/releases/tag/v2026.1.5
- github.com https://github.com/discourse/discourse/releases/tag/v2026.4.2
- github.com https://github.com/discourse/discourse/releases/tag/v2026.5.1
- github.com https://github.com/discourse/discourse/releases/tag/v2026.6.0
- github.com https://github.com/discourse/discourse/security/advisories/GHSA-wg5x-7f23-m3r5