{"id":"CVE-2026-101878","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-101878","generatedAt":"2026-10-27T23:45:16.957Z","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 login…","description":"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.","published":"2026-09-29T02:16:55.000Z","lastModified":"2026-09-30T17:23:09.000Z","status":"Awaiting Analysis","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":7.7,"severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-303"],"affected":[],"epss":{"score":0.00258,"percentile":0.17366,"date":"2026-10-26","history":[{"date":"2026-09-29","score":0.00258,"percentile":0.15761}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-29T02:16:55.000Z","detail":{"score":"7.7","severity":"HIGH","publishedAt":"2026-09-29T02:16:54.990Z"},"summary":"New CVE, high severity (CVSS 7.7)."}],"references":[{"url":"https://github.com/bitwarden/server/commit/27ae3d5455f723975fac03819eaeba8710666bc4","source":"disclosure@vulncheck.com"},{"url":"https://github.com/bitwarden/server/pull/7501","source":"disclosure@vulncheck.com"},{"url":"https://github.com/bitwarden/server/releases/tag/v2026.5.0","source":"disclosure@vulncheck.com"},{"url":"https://sanjokkarki.com.np/blog/bitwarden-sso-externalid-truncation","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-sso-identifier-truncation","source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-101878","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}