EUVD-2026-13190Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Unauthorized user warnings in Discourse prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 can be issued by authenticated non-staff users due to a type coercion flaw in the post actions API endpoint. Attackers with valid login credentials can exploit this to send warnings meant only for staff moderators, though no data exposure or further privilege escalation occurs. …
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| Risk Assessment | An attacker with limited access can gain administrative or root privileges, enabling full control over the affected system. Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
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