{"id":"CVE-2022-39203","aliases":["GHSA-xvqg-mv25-rwvw"],"url":"https://o3.security/vulnerability/CVE-2022-39203","summary":"Parsing issue in matrix-org/node-irc leading to room takeovers","details":"### Impact\n\nAttackers 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.\n\n### Patched\n\nThe vulnerability has been patched in matrix-appservice-irc 0.35.0.\n\n### Workarounds\n\nDisable 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.\n\n### References\n\n- https://matrix.org/blog/2022/09/13/security-release-of-matrix-appservice-irc-0-35-0-high-severity\n\n### Credits\n\nDiscovered and reported by [Val Lorentz](https://valentin-lorentz.fr/).\n\n### For more information\n\nIf you have any questions or comments about this advisory email us at [security@matrix.org](mailto:security@matrix.org).","published":"2022-09-13T18:15:12Z","modified":"2026-08-12T03:51:09.548082005Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"matrix-appservice-irc","fixedVersion":"0.35.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/39xxx/CVE-2022-39203.json"},{"type":"ADVISORY","url":"https://github.com/matrix-org/matrix-appservice-irc/security/advisories/GHSA-xvqg-mv25-rwvw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-39203"},{"type":"ARTICLE","url":"https://matrix.org/blog/2022/09/13/security-release-of-matrix-appservice-irc-0-35-0-high-severity/"},{"type":"PACKAGE","url":"https://github.com/matrix-org/matrix-appservice-irc"},{"type":"WEB","url":"https://matrix.org/blog/2022/09/13/security-release-of-matrix-appservice-irc-0-35-0-high-severity"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:09.548082005Z"}}