Discourse: Review queue exposes flag-related private message excerpts to category group moderators

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-59829
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-17 16:17:01 UTC
Updated2026-08-17 19:16:32 UTC
DescriptionDiscourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.1, on sites with category group moderation enabled, the review queue could include an excerpt (and permalink) of the private message attached to a flag, even when the reviewing category moderator was not a participant in that message. These notify_moderators flag messages are addressed only to moderators and, for core flags, to a category's moderation groups as they existed when the flag was raised, so a category group moderator could read flag-discussion content they were not authorized to see. This affects official plugins that create such messages and core flags raised before a moderator's group was granted moderation of the category. Only the confidentiality of a limited excerpt of these flag-related private messages is affected; no content can be modified or deleted. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.1.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

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

EPSS: 0.002280000 probability, percentile 0.137260000 (date 2026-08-18)

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

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

References

ReferenceSourceLinkTags
github.com/discourse/discourse/commit/e56bd3ec58ae387946220821d1ce214eed... [email protected] github.com
github.com/discourse/discourse/commit/4df0e54f59361c78606b578ad12a2c39b4... [email protected] github.com
github.com/discourse/discourse/commit/74c8522a197658c69b0adefa182f601ce8... [email protected] github.com
github.com/discourse/discourse/commit/58e45dc7c92d19d5294c73fbcd3833c73d... [email protected] github.com
github.com/discourse/discourse/pull/41527 [email protected] github.com
github.com/discourse/discourse/security/advisories/GHSA-wmc6-pmxp-xw5w [email protected] github.com
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