BIT-discourse-2026-53962: Discourse: Insufficient SVG sanitization logic
Discourse versions prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5 contain insufficient SVG sanitization in upload and user avatar handling. This vulnerability could allow cross-site scripting (XSS) when users visit certain uncommon URLs. The issue has been fixed in the specified later versions.
AI Analysis
Technical Summary
Discourse, an open-source discussion platform, had a vulnerability identified as CVE-2026-53962 involving insufficient sanitization of SVG files during upload and user avatar processing. This flaw could lead to cross-site scripting attacks if a user visits specific URLs that are not typically part of normal community browsing. The vulnerability affects versions prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5 and has been addressed in these fixed versions.
Potential Impact
The vulnerability enables cross-site scripting (XSS) attacks via specially crafted SVG files uploaded or used as avatars. This could allow attackers to execute malicious scripts in the context of the affected Discourse instance when users visit certain URLs. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade Discourse to version 2026.6.0, 2026.5.1, 2026.4.2, or 2026.1.5 or later, as these versions contain the fix for the insufficient SVG sanitization vulnerability. No additional mitigation is required once updated.
BIT-discourse-2026-53962: Discourse: Insufficient SVG sanitization logic
Description
Discourse versions prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5 contain insufficient SVG sanitization in upload and user avatar handling. This vulnerability could allow cross-site scripting (XSS) when users visit certain uncommon URLs. The issue has been fixed in the specified later versions.
Affected software
pkg:bitnami/discourseRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Discourse, an open-source discussion platform, had a vulnerability identified as CVE-2026-53962 involving insufficient sanitization of SVG files during upload and user avatar processing. This flaw could lead to cross-site scripting attacks if a user visits specific URLs that are not typically part of normal community browsing. The vulnerability affects versions prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5 and has been addressed in these fixed versions.
Potential Impact
The vulnerability enables cross-site scripting (XSS) attacks via specially crafted SVG files uploaded or used as avatars. This could allow attackers to execute malicious scripts in the context of the affected Discourse instance when users visit certain URLs. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade Discourse to version 2026.6.0, 2026.5.1, 2026.4.2, or 2026.1.5 or later, as these versions contain the fix for the insufficient SVG sanitization vulnerability. No additional mitigation is required once updated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BIT-discourse-2026-53962
- Osv Schema Version
- 1.6.2
- Aliases
- ["CVE-2026-53962"]
- Ecosystems
- ["Bitnami"]
- Database Specific Severity
- Medium
- Cvss Version
- null
Threat ID: 6a58b51a68715ace43db4589
Added to database: 07/16/2026, 10:40:26 UTC
Last enriched: 07/16/2026, 14:29:35 UTC
Last updated: 07/16/2026, 19:47:32 UTC
Views: 4
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.