CVE-2023-38700: Matrix Irc Bridge

Low severity, CVSS 3.7. EPSS: 0.6% chance of exploitation in the next 30 days.

matrix-appservice-irc is a Node.js IRC bridge for Matrix. Prior to version 1.0.1, it was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target. Version 1.0.1n fixes this issue. As a workaround, set the `matrixHandler.eventCacheSize` config value to `0`. This workaround may impact performance.

Affected products

• Matrix Matrix Irc Bridge: before 1.0.1 (fixed in 1.0.1)

Published 2023-08-04. Last modified 2026-06-17.