Description
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.
INFO
Published Date :
2026-03-19T20:56:17.272Z
Last Modified :
2026-03-20T18:10:38.878Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-27740 vulnerability.
| Vendors | Products |
|---|---|
| Discourse |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-27740.
