{"id":"CVE-2022-36009","summary":"Incorrect parsing of access level in gomatrixserverlib and dendrite","details":"gomatrixserverlib is a Go library for matrix protocol federation. Dendrite is a Matrix homeserver written in Go, an alternative to Synapse. The power level parsing within gomatrixserverlib was failing to parse the `\"events_default\"` key of the `m.room.power_levels` event, defaulting the event default power level to zero in all cases. Power levels are the matrix terminology for user access level. In rooms where the `\"events_default\"` power level had been changed, this could result in events either being incorrectly authorised or rejected by Dendrite servers. gomatrixserverlib contains a fix as of commit `723fd49` and Dendrite 0.9.3 has been updated accordingly. Matrix rooms where the `\"events_default\"` power level has not been changed from the default of zero are not vulnerable. Users are advised to upgrade. There are no known workarounds for this issue.","aliases":["GHSA-grvv-h2f9-7v9c","GO-2022-0952"],"modified":"2026-04-10T04:49:42.773972Z","published":"2022-08-19T20:35:09Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/36xxx/CVE-2022-36009.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-863"]},"references":[{"type":"WEB","url":"https://matrix.org/docs/guides/moderation/#power-levels"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/36xxx/CVE-2022-36009.json"},{"type":"ADVISORY","url":"https://github.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-36009"},{"type":"FIX","url":"https://github.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/matrix-org/dendrite","events":[{"introduced":"0"},{"last_affected":"ef7262a7a21f6106b8130a7ad8a1911cbd46a82f"}],"database_specific":{"versions":[{"introduced":"0"},{"last_affected":"0.9.2"}]}},{"type":"GIT","repo":"https://github.com/matrix-org/gomatrixserverlib","events":[{"introduced":"0"},{"fixed":"723fd495dde835d078b9f2074b6b62c06dea4575"}]}],"versions":["v0.1.0","v0.2.0","v0.2.1","v0.3.0","v0.3.1","v0.3.10","v0.3.11","v0.3.2","v0.3.3","v0.3.4","v0.3.5","v0.3.6","v0.3.7","v0.3.8","v0.3.9","v0.4.0","v0.4.1","v0.5.0","v0.5.0rc1","v0.5.1","v0.6","v0.6.0","v0.6.1","v0.6.2","v0.6.3","v0.6.4","v0.6.5","v0.7.0","v0.8.0","v0.8.1","v0.8.2","v0.8.3","v0.8.3rc1","v0.8.4","v0.8.5","v0.8.6","v0.8.7","v0.8.8","v0.8.9","v0.9.0","v0.9.1","v0.9.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-36009.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L"}]}