Discourse: Authorization bypass in oneboxer via user-controlled category id

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-32951
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-31 18:16:51 UTC
Updated2026-04-01 14:23:37 UTC
DescriptionDiscourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an authenticated user can obtain shared draft topic titles by sending an inline onebox request with a category_id parameter matching the shared drafts category. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.

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: 0.000270000 probability, percentile 0.075060000 (date 2026-04-01)

Problem Types: CWE-200 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

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, < 2026.1.3 Not specified
CNA Discourse Discourse affected >= 2026.2.0-latest, < 2026.2.2 Not specified
CNA Discourse Discourse affected >= 2026.3.0-latest, < 2026.3.0 Not specified

References

ReferenceSourceLinkTags
github.com/discourse/discourse/commit/0b4e6ff170362823d1cfe2a1a096785d0d... [email protected] github.com
github.com/discourse/discourse/security/advisories/GHSA-v93g-8f4f-4rgm [email protected] github.com
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