sanjokkarki.com.np Bitwarden SSO Vulnerability CVE-2026-101878 Exposes User Accounts
Article Content
- •CVE-2026-101878 allows unauthorized access via SSO due to identifier truncation.
- •The vulnerability affects Bitwarden Server versions 2025.6.0 to 2026.5.0.
- •Immediate patching is recommended to mitigate risks associated with this vulnerability.
A vulnerability in Bitwarden Server versions 2025.6.0 to 2026.5.0 allows attackers to exploit a mismatch in the SSO login process. The @ExternalId parameter in the User_ReadBySsoUserOrganizationIdExternalId stored procedure is declared as NVARCHAR(50), while the corresponding column can store NVARCHAR(300). This discrepancy leads to silent truncation of identifiers, enabling an attacker with a crafted identifier to authenticate as another user if their identifier begins with the victim's 50-character prefix. The vulnerability, tracked as CVE-2026-101878, has been rated high severity by the reporter, although Bitwarden classified it as medium. Affected systems include both cloud and self-hosted deployments using SQL Server. The issue was reported to HackerOne and has been patched in release v2026.5.0 on May 29, 2026.
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