EUVD-2026-13492Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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:H/I:N/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 user could access another user's private activity due to insufficient authorization checks in the user actions endpoint. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch.
AnalysisAI
Discourse versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain an authorization bypass vulnerability in the user actions endpoint that allows authenticated users to access other users' private activity data. An attacker with valid login credentials can enumerate and view private user actions without proper permission checks, resulting in information disclosure. …
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Vulnerability AssessmentAI
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N) indicates low overall severity: the attack is network-accessible with low complexity, requires low privileges (authenticated user), and causes low confidentiality impact with no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated user (e.g., a regular community member) registers for the Discourse forum and then directly queries the user actions API endpoint with another user's ID in the request parameters (e.g., /user-actions?user_id=5). Due to missing authorization checks, the API returns that target user's private activity history, including private messages, non-public posts, and other sensitive actions. … |
| Remediation | Upgrade Discourse to version 2026.1.2, 2026.2.1, or 2026.3.0-latest.1 or later depending on which branch your instance is running. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 30 days: Identify affected systems running the user actions endpoint. …
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