Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, a type coercion issue in a post actions API endpoint allowed non-staff users to issue warnings to other users. Warnings are a staff-only moderation feature. The vulnerability required the attacker to be a logged-in user and to send a specifically crafted request. No data exposure or privilege escalation beyond the ability to create unauthorized user warnings was possible. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
discourse discourse affected
Version Status Constraints
>= 2026.1.0-latest, < 2026.1.2 affected —
>= 2026.2.0-latest, < 2026.2.1 affected —
= 2026.3.0-latest affected —

No data.

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757be cve-icon cve-icon
https://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89 cve-icon cve-icon
https://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886 cve-icon cve-icon
https://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4j cve-icon cve-icon
History

Thu, 19 Mar 2026 21:00:00 +0000

Type Values Removed Values Added
Description Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, a type coercion issue in a post actions API endpoint allowed non-staff users to issue warnings to other users. Warnings are a staff-only moderation feature. The vulnerability required the attacker to be a logged-in user and to send a specifically crafted request. No data exposure or privilege escalation beyond the ability to create unauthorized user warnings was possible. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
Title Discourse has a bypass of official warnings messages by non-staff users
Weaknesses CWE-862
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-19T20:47:54.668Z

Reserved: 2026-02-19T19:46:03.541Z

Link: CVE-2026-27491

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-19T21:17:09.090

Modified: 2026-03-19T21:17:09.090

Link: CVE-2026-27491

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses