{"schema":"threatline.record/2","record":{"id":"CVE-2026-101878","aliases":[],"summary":"Bitwarden Server 2025.6.0 < 2025.6.0 Authentication Bypass via SSO Identifier Truncation","details":"Bitwarden Server 2025.6.0 before 2026.5.0 declares the @ExternalId parameter of the User_ReadBySsoUserOrganizationIdExternalId stored procedure as NVARCHAR(50) while the column it queries stores NVARCHAR(300), silently truncating the SSO login identifier on SQL Server deployments and allowing a user whose identity-provider identifier begins with another organization member's full 50-character identifier to authenticate as that member and obtain a victim-scoped access token.","categories":["Unclassified"],"product":"bitwarden server","vendor":"bitwarden","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-101878","source_modified_at":"2026-10-01T19:19:18.222Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"bitwarden server","vendor":"bitwarden","versions":[{"status":"affected","version":"2025.6.0","versionType":"custom","lessThan":"2026.5.0"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-101878","source_modified_at":"2026-10-01T19:19:18.222Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"bitwarden server","ecosystem":null},"version":"2026.5.0","basis":"first unaffected version stated in the CVE record"}],"cvss":7.7,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00258,"percentile":0.16581,"score_date":"2026-10-23"},"published_at":"2026-09-29T01:58:32.484Z","modified_at":"2026-10-01T19:19:18.222Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-101878","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-01T19:19:18.222Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-101878","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://sanjokkarki.com.np/blog/bitwarden-sso-externalid-truncation","tags":["technical-description","exploit"]},{"source":"CVE List","url":"https://github.com/bitwarden/server/releases/tag/v2026.5.0","tags":["release-notes"]},{"source":"CVE List","url":"https://github.com/bitwarden/server/pull/7501","tags":["issue-tracking"]},{"source":"CVE List","url":"https://github.com/bitwarden/server/commit/27ae3d5455f723975fac03819eaeba8710666bc4","tags":["patch"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-sso-identifier-truncation","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"total","assessed_at":"2026-09-29T17:21:45.867113Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-01T19:19:18.222Z","content_hash":"386166de3c31dfe7a60ab86f6248e215dcec9b5d428888338c1632aeee1f2ff5"}}