CVE-2025-27146: Matrix IRC Bridge allows IRC command injection to own puppeted user

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-25 · updated 2026-06-17
Weakness: CWE-77

Description

matrix-appservice-irc is a Node.js IRC bridge for Matrix. The matrix-appservice-irc bridge up to version 3.0.3 contains a vulnerability which can lead to arbitrary IRC command execution as the puppeted user. The attacker can only inject commands executed as their own IRC user. The vulnerability has been patched in matrix-appservice-irc version 3.0.4.

Affected products

matrix-org matrix-appservice-irc: before 3.0.4 — fixed in 3.0.4

How to fix

Upgrade to a fixed version: matrix-org matrix-appservice-irc 3.0.4. Check the vendor advisory for mitigations.

References

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