CVE-2026-59828
Discourse: Hidden post revisions leak through adjacent visible diffs
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Description
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, post revisions that should be hidden from regular users could be leaked through visible diffs on adjacent revisions serialized by PostRevisionSerializer. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://github.com/discourse/discourse/security/advisories/GHSA-q456-4f8q-42vx
- https://github.com/discourse/discourse/commit/1f26c1163ce87a2abbd1d01780ab1b5fb16e75f6
- https://github.com/discourse/discourse/commit/8b773332b0f937dfcd894ed56d56fc5a81578d9d
- https://github.com/discourse/discourse/commit/8d36da1b68c906592abde3f2e94d505cdf097435
- https://github.com/discourse/discourse/commit/d58988d46bb1019bfa8b8330ae81a1a134e08511
References (9)
SSVC — Action Prioritization
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- LOW
- Integrity
- NONE
- Availability
- NONE
Quick Info
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