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
Affected Vendors & Products
References
History
Thu, 01 Oct 2026 19:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Bitwarden server
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| CPEs | cpe:2.3:a:bitwarden:server:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Bitwarden server
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Tue, 29 Sep 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Tue, 29 Sep 2026 13:15:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Bitwarden
Bitwarden bitwarden |
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| Vendors & Products |
Bitwarden
Bitwarden bitwarden |
Tue, 29 Sep 2026 02:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Bitwarden Server 2025.6.0 < 2025.6.0 Authentication Bypass via SSO Identifier Truncation | |
| Weaknesses | CWE-303 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-09-29T01:58:32.484Z
Updated: 2026-10-01T19:19:18.222Z
Reserved: 2026-09-28T15:44:45.389Z
Link: CVE-2026-101878
Updated: 2026-09-29T17:21:57.658Z
Status : Awaiting Analysis
Published: 2026-09-29T02:16:54.990
Modified: 2026-09-30T17:23:08.953
Link: CVE-2026-101878
No data.