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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

Discourse XSS via prompt injection in AI triage Review Queue (CVE-2026-27740)

Discourse versions before 2026.3.0-latest.1, 2026.2.1 and 2026.1.2 rendered raw LLM output with htmlSafe in the Review Queue, so an attacker could use prompt injection to make the AI return a malicious payload that executed when staff viewed a flagged post. Patched releases are available, with disabling AI triage automation scripts as a workaround.

Disclosed 19 March 2026 · Record updated 13 September 2026

Impact

Stored cross-site scripting executing in the browser of admins/moderators viewing flagged posts in the Review Queue.

Our coverage

No articles linked to this incident yet.

Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-27740