{"id":"CVE-2022-36009","state":"PUBLISHED","title":"Incorrect parsing of access level in gomatrixserverlib and dendrite","description":"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.","publishedAt":"2022-08-19T20:35:09.000Z","updatedAt":"2025-04-23T17:48:13.250Z","severity":{"score":5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["matrix-org gomatrixserverlib"],"affected":[{"vendor":"matrix-org","product":"gomatrixserverlib","versions":[{"version":"< 0.9.3 for dendrite","status":"affected"},{"version":" < 723fd49 for gomatrixserverlib","status":"affected"}]}],"references":["https://github.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9c","https://github.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575","https://matrix.org/docs/guides/moderation/#power-levels"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T19:50:21.136Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/36xxx/CVE-2022-36009.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2022-36009","state":"PUBLISHED","datePublished":"2022-08-19T20:35:09.000Z","dateUpdated":"2025-04-23T17:48:13.250Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2022-07-15T00:00:00.000Z"},"containers":{"cna":{"title":"Incorrect parsing of access level in gomatrixserverlib and dendrite","descriptions":[{"lang":"en","value":"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. 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