CVE-2026-101878
HIGH
7,7
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: low
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A
HIGH
7,5
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Description
AI Translation Available
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.
303
Incorrect Implementation of Authentication Algorithm
DraftCommon Consequences
Security Scopes Affected:
Access Control
Potential Impacts:
Bypass Protection Mechanism
Applicable Platforms
All platforms may be affected
https://github.com/bitwarden/server/commit/27ae3d5455f723975fac03819eaeba871066…
https://github.com/bitwarden/server/pull/7501
https://github.com/bitwarden/server/releases/tag/v2026.5.0
https://sanjokkarki.com.np/blog/bitwarden-sso-externalid-truncation
https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via…