Discourse: Shared-draft titles and excerpts leak through group post serialization (CVE-2026-55704)
Discourse versions prior to 2026.1.6, 2026.5.2, and 2026.6.1 could leak shared-draft topic titles and post excerpts through group post serialization endpoints to users who can view group activity but are not authorized to see drafts. This results in information disclosure of unpublished draft content. The issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
AI Analysis
Technical Summary
A vulnerability in Discourse allows unauthorized users who have permission to view a group's activity but not shared drafts to receive shared-draft entries via the group posts and group mentions API endpoints. This causes an information disclosure of unpublished draft topic titles and post excerpts. The flaw affects multiple version ranges prior to the fixed releases. The issue has been addressed in Discourse versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
Potential Impact
Unauthorized disclosure of unpublished draft titles and post excerpts to users who should not have access to shared drafts, potentially exposing sensitive or confidential information before publication.
Mitigation Recommendations
Upgrade Discourse to version 2026.1.6, 2026.5.2, 2026.6.1, or later (including 2026.7.0) where this vulnerability is fixed.
Discourse: Shared-draft titles and excerpts leak through group post serialization (CVE-2026-55704)
Description
Discourse versions prior to 2026.1.6, 2026.5.2, and 2026.6.1 could leak shared-draft topic titles and post excerpts through group post serialization endpoints to users who can view group activity but are not authorized to see drafts. This results in information disclosure of unpublished draft content. The issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
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
A vulnerability in Discourse allows unauthorized users who have permission to view a group's activity but not shared drafts to receive shared-draft entries via the group posts and group mentions API endpoints. This causes an information disclosure of unpublished draft topic titles and post excerpts. The flaw affects multiple version ranges prior to the fixed releases. The issue has been addressed in Discourse versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
Potential Impact
Unauthorized disclosure of unpublished draft titles and post excerpts to users who should not have access to shared drafts, potentially exposing sensitive or confidential information before publication.
Mitigation Recommendations
Upgrade Discourse to version 2026.1.6, 2026.5.2, 2026.6.1, or later (including 2026.7.0) where this vulnerability is fixed.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- BIT-discourse-2026-55704
- Osv Schema Version
- 1.6.2
- Aliases
- ["CVE-2026-55704"]
- Ecosystems
- ["Bitnami"]
- Database Specific Severity
- Medium
- Cvss Version
- null
Threat ID: 6a885f20acd9273b493f7d11
Added to database: 08/21/2026, 14:22:24 UTC
Last enriched: 08/21/2026, 14:30:17 UTC
Last updated: 08/21/2026, 22:52:13 UTC
Views: 3
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