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EUVD-2026-233719

2026-10-18T05:39:34.090153+00:00

EUVD-2026-233719

fkie_cve-2022-39203

2026-10-18T05:39:34.090186+00:00

matrix-appservice-irc is an open source Node.js IRC bridge for Matrix. Attackers can specify a specific string of characters, which would confuse the bridge into combining an attacker-owned channel and an existing channel, allowing them to grant themselves permissions in the channel. The vulnerability has been patched in matrix-appservice-irc 0.35.0. As a workaround operators may disable dynamic channel joining via `dynamicChannels.enabled` to prevent users from joining new channels, which prevents any new channels being bridged outside of what is already bridged, and what is specified in the config.

GHSA-xvqg-mv25-rwvw — Parsing issue in matrix-org/node-irc leading to room takeovers

2026-10-18T05:39:34.090226+00:00

Affected: npm: matrix-appservice-irc

### Impact

Attackers can specify a specific string of characters, which would confuse the bridge into combining an attacker-owned channel and an existing channel, allowing them to grant themselves permissions in the channel.

### Patched

The vulnerability has been patched in matrix-appservice-irc 0.35.0.

### Workarounds

Disable dynamic channel joining via `dynamicChannels.enabled` to prevent users from joining new channels, which prevents any new channels being bridged outside of what is already bridged, and what is specified in the config.

### References

- https://matrix.org/blog/2022/09/13/security-release-of-matrix-appservice-irc-0-35-0-high-severity

### Credits

Discovered and reported by [Val Lorentz](https://valentin-lorentz.fr/).

### For more information

If you have any questions or comments about this advisory email us at [security@matrix.org](mailto:security@matrix.org).

gsd-2022-39203

2026-10-18T05:39:34.090264+00:00

gsd-2022-39203