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CVE-2026-101878 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/bitwarden/server/commit/27ae3d5455f723975fac03819eaeba8710666bc4	[email protected]
https://github.com/bitwarden/server/pull/7501	[email protected]
https://github.com/bitwarden/server/releases/tag/v2026.5.0	[email protected]
https://sanjokkarki.com.np/blog/bitwarden-sso-externalid-truncation	[email protected]
https://www.vulncheck.com/advisories/bitwarden-server-authentication-bypass-via-sso-identifier-truncation	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-303	Incorrect Implementation of Authentication Algorithm	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 29, 2026	CVE Modified	CISA-ADP
Sep 29, 2026	New CVE Received	[email protected]