CVEvulnerability
CVE-2026-101878
7.7 HIGH
Official page ↗
- Status
- Awaiting Analysis
- Published
- 2026-09-29
- Last modified
- 2026-09-30
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 7.7 HIGH — 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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-303
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.
Related
Weakness · CWE (1)
- CWE-303 Incorrect Implementation of Authentication Algorithm weakness
References
- https://github.com/bitwarden/server/commit/27ae3d5455f723975fac03819eaeba8710666bc4 github.com
- https://github.com/bitwarden/server/pull/7501 github.com
- https://github.com/bitwarden/server/releases/tag/v2026.5.0 github.com
- https://sanjokkarki.com.np/blog/bitwarden-sso-externalid-truncation sanjokkarki.com.np
- https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-sso-identifier-truncation www.vulncheck.com