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CVE-2026-53962Discourse: Insufficient SVG sanitization logic
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.
5.4 MEDIUMEPSS 0.41%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 5.4 | MEDIUM | 3.1GitHub_M (CNA) | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Details
- CVE ID
- CVE-2026-53962
- Status
- Analyzed
- Assigner (CNA)
- GitHub_M
- Published
- Jul 9, 2026
- Last modified
- 2026-07-14 01:35 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/3ee8343cd7f00d59d8513bee0a12e02d50bfc358
- github.com https://github.com/discourse/discourse/commit/810c2715799fd08b06fd6ffc664d9562fe9ea6ff
- github.com https://github.com/discourse/discourse/commit/92a699d89b84685b6fdd63cd0d0e371793c69dad
- github.com https://github.com/discourse/discourse/commit/b8ceb49f4ba52257be30eb3c2ce51a5bf03be5fe
- 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-jmcf-3367-78vv