Is CVE-2026-27740 actively exploited?

No active exploitation of CVE-2026-27740 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27740 be exploited remotely?

Yes. CVE-2026-27740 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-27740?

CVE-2026-27740 has a CVSS score of 6.1 (MEDIUM).

HOME VULNERABILITIESCVE-2026-27740

MEDIUM

CVE-2026-27740

CWE-79Published: March 19, 2026· Updated: Mar 25, 2026

6.1

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:14.2th

Official 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.

NVD Source

Technical Analysis

CVE-2026-27740 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.