BIT-discourse-2026-59828: Discourse: Hidden post revisions leak through adjacent visible diffs
Discourse versions prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5 contain a vulnerability where hidden post revisions can be leaked through visible diffs on adjacent revisions. This occurs due to the PostRevisionSerializer exposing information that should remain hidden from regular users. The issue has been fixed in the specified versions.
AI Analysis
Technical Summary
Discourse, an open-source discussion platform, had a vulnerability (CVE-2026-59828) affecting multiple version branches before 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5. The vulnerability allowed post revisions that were intended to be hidden from regular users to be leaked via visible diffs on adjacent revisions serialized by the PostRevisionSerializer component. This could lead to unintended disclosure of content changes that should remain confidential. The issue is resolved in the fixed versions listed.
Potential Impact
The vulnerability could result in unauthorized disclosure of hidden post revisions to regular users, potentially exposing sensitive or private content changes. There is no indication of further exploitation or escalation beyond information leakage. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade Discourse to one of the fixed versions: 2026.6.0, 2026.5.1, 2026.4.2, or 2026.1.5. These versions contain the official fix for this vulnerability. No additional mitigation steps are indicated.
BIT-discourse-2026-59828: Discourse: Hidden post revisions leak through adjacent visible diffs
Description
Discourse versions prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5 contain a vulnerability where hidden post revisions can be leaked through visible diffs on adjacent revisions. This occurs due to the PostRevisionSerializer exposing information that should remain hidden from regular users. The issue has been fixed in the specified 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 (CVE-2026-59828) affecting multiple version branches before 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5. The vulnerability allowed post revisions that were intended to be hidden from regular users to be leaked via visible diffs on adjacent revisions serialized by the PostRevisionSerializer component. This could lead to unintended disclosure of content changes that should remain confidential. The issue is resolved in the fixed versions listed.
Potential Impact
The vulnerability could result in unauthorized disclosure of hidden post revisions to regular users, potentially exposing sensitive or private content changes. There is no indication of further exploitation or escalation beyond information leakage. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade Discourse to one of the fixed versions: 2026.6.0, 2026.5.1, 2026.4.2, or 2026.1.5. These versions contain the official fix for this vulnerability. No additional mitigation steps are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BIT-discourse-2026-59828
- Osv Schema Version
- 1.6.2
- Aliases
- ["CVE-2026-59828"]
- Ecosystems
- ["Bitnami"]
- Database Specific Severity
- Medium
- Cvss Version
- null
Threat ID: 6a561c4a68715ace4365a2e7
Added to database: 07/14/2026, 11:23:54 UTC
Last enriched: 07/14/2026, 11:33:03 UTC
Last updated: 08/25/2026, 22:52:12 UTC
Views: 96
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