{"id":"CVE-2026-101878","title":"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…","summary":"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…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-303"],"vendor":"bitwarden","product":"bitwarden server","affected":["server >= 2025.6.0 < 2026.5.0"],"published":"2026-09-29","updated":"2026-09-30","sourceUpdated":"2026-09-30T17:23:08.953","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-101878","references":[{"url":"https://github.com/bitwarden/server/commit/27ae3d5455f723975fac03819eaeba8710666bc4","label":"disclosure@vulncheck.com"},{"url":"https://github.com/bitwarden/server/pull/7501","label":"disclosure@vulncheck.com"},{"url":"https://github.com/bitwarden/server/releases/tag/v2026.5.0","label":"disclosure@vulncheck.com"},{"url":"https://sanjokkarki.com.np/blog/bitwarden-sso-externalid-truncation","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-sso-identifier-truncation","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00258,"epssPercentile":0.17429,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-29T17:21:45.867113Z"},"ingestedAt":"2026-09-29T02:25:39.971Z","slug":"CVE-2026-101878","body":"## Overview\n\nBitwarden 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":212881,"id":"CVE-2026-101878","ts":1790703746700,"field":"exploit_available","old":"false","new":"true"}]}