EUVD-2026-13194Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/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:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a cross-site scripting vulnerability that arises because the system trusts the raw output from an AI Large Language Model (LLM) and renders it using htmlSafe in the Review Queue interface without adequate sanitization. A malicious attacker can use valid Prompt Injection techniques to force the AI to return a malicious payload (e.g., tags). When a Staff member (Admin/Moderator) views the flagged post in the Review Queue, the payload executes. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, temporarily disable AI triage automation scripts.
AnalysisAI
Cross-site scripting in Discourse's Review Queue interface allows remote attackers to inject malicious payloads through prompt injection attacks against the AI triage system, which renders unsanitized LLM output to staff members. When administrators or moderators view flagged posts, the injected payload executes in their browser context, potentially compromising their sessions or performing unauthorized actions. …
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Vulnerability AssessmentAI
| Risk Assessment | Attackers can steal session cookies, redirect users to malicious sites, deface content, or perform actions on behalf of authenticated users. Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker injects a JavaScript payload into a vulnerable input field. When another user views the page, the script executes in their browser, stealing their session token. |
| Remediation | Encode all user-supplied output contextually (HTML, JS, URL). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …
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