{"id":"CVE-2026-43639","summary":"Bitwarden Server \u003c 2026.4.0 Missing Authorization via Provider Clients","details":"Bitwarden Server prior to v2026.4.0 contains a missing authorization vulnerability that allows a provider service user to add an arbitrary organization to their provider via `POST /providers/{providerId}/clients/existing`, resulting in takeover of the target organization; self-hosted installations are unaffected as this endpoint is restricted to Cloud via SelfHosted(NotSelfHostedOnly = true).","modified":"2026-07-16T03:31:17.640699845Z","published":"2026-05-11T17:14:04.552Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43639.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-862"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43639.json"},{"type":"ADVISORY","url":"https://github.com/bitwarden/server/releases/tag/v2026.4.0"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43639"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-provider-clients"},{"type":"REPORT","url":"https://github.com/bitwarden/server/pull/7372"},{"type":"FIX","url":"https://github.com/bitwarden/server/commit/0918bfdda6f5eec391c69bd9074f6aef4eac0b1d"},{"type":"PACKAGE","url":"https://github.com/bitwarden/server"},{"type":"EVIDENCE","url":"https://sanjokkarki.com.np/blog/bitwarden-provider-takeover"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bitwarden/server","events":[{"introduced":"0"},{"fixed":"a2efc7409cea90dfb9ffae309851935f57294f3f"},{"fixed":"0918bfdda6f5eec391c69bd9074f6aef4eac0b1d"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2026.4.0"}],"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:*"}}],"versions":["v2025.10.1","v2025.8.1","v2025.7.1","v2024.10.1","v2024.8.1","v2024.8.0","v2024.5.0","v2024.2.3","v2024.1.2","v1.39.0","v1.38.2","v1.38.1","v1.38.0","v1.37.2","v1.37.1","v1.37.0","v1.36.1","v1.36.0","v1.35.1","v1.35.0","v1.34.0","v1.33.1","v1.33.0","v1.32.0","v1.31.1","v1.31.0","v1.30.4","v1.30.3","v1.30.2","v1.30.1","v1.30.0","v1.29.0","v1.28.0","v1.27.0","v1.26.0","v1.25.0","v1.24.0","v1.23.0","1.22.0","v1.21.0","v1.20.0","v1.19.0","v1.18.0","v1.17.2","v1.17.1","v1.17.0","v1.16.0","v1.15.1","v1.15.0","v1.14.2","v1.14.1","v1.14.0","v1.13.1","v1.13.0","v1.12.1","v1.12.0","v1.11.1","v1.11.0","v1.10.0","v1.9.0","v1.8.2","v1.8.1","v1.8.0","v1.7.0","v1.6.0","v1.5.1","v1.5.0","v1.4.1","1.4.0","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.0","v1.1.0","v1.0.3","v1.0.2","v1.0.1","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43639.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"}]}