Discourse: Non-participant moderators can read, edit, and delete PM content through Discourse AI reviewables

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-84302
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 17:17:06 UTC
Updated2026-09-24 18:19:03 UTC
DescriptionDiscourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, Discourse AI reviewables associated with private messages could appear in the moderator review queue of a moderator who was not a participant in the message. Reviewable visibility filtering did not restrict private-message reviewables to the audience permitted to access the underlying private-message topic, allowing the moderator to read otherwise confidential content. Depending on the available reviewable action, the moderator could also modify the private message by closing its topic or deleting a post. Exploitation requires an authenticated moderator account and a pre-existing Discourse AI reviewable associated with a private message. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

Risk And Classification

Primary CVSS: v3.1 4.2 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

Problem Types: CWE-862 | CWE-862 CWE-862: Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.2MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N
3.1CNADECLARED4.2MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Discourse Discourse affected < 2026.7.0 Not specified
CNA Discourse Discourse affected >= 2026.6.0-latest, < 2026.6.1 Not specified
CNA Discourse Discourse affected >= 2026.5.0-latest, < 2026.5.2 Not specified
CNA Discourse Discourse affected >= 2026.1.0-latest, < 2026.1.6 Not specified

References

ReferenceSourceLinkTags
github.com/discourse/discourse/commit/1566d04524c01472375944bbf7b198dd09... [email protected] github.com
github.com/discourse/discourse/commit/b323702d87cd82c327c116d9566477f3c4... [email protected] github.com
github.com/discourse/discourse/security/advisories/GHSA-3rx9-fqgh-wfpc [email protected] github.com
github.com/discourse/discourse/commit/38d10c0e5d1b76540d2860455e0290f8e9... [email protected] github.com
github.com/discourse/discourse/pull/42091 [email protected] github.com
github.com/discourse/discourse/commit/23488b72a200228e805c4e6d970fbad216... [email protected] github.com
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