CVE-2026-101878
highBitwarden Server 2025.6.0 before 2026.5.0 declares the @ExternalId parameter of the User_ReadBySsoUserOrganizationIdExternalId stored procedure as NVARCHAR(50)…
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.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/bitwarden/server/commit/27ae3d5455f723975fac03819eaeba8710666bc4 disclosure@vulncheck.com
- https://github.com/bitwarden/server/pull/7501 disclosure@vulncheck.com
- https://github.com/bitwarden/server/releases/tag/v2026.5.0 disclosure@vulncheck.com
- https://sanjokkarki.com.np/blog/bitwarden-sso-externalid-truncation disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-sso-identi... disclosure@vulncheck.com