Bug 2500996 (CVE-2026-47164)

Summary: CVE-2026-47164 vaultwarden: Vaultwarden: Account takeover via SSO email auto-linking vulnerability
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Vaultwarden, a Bitwarden-compatible server. The Single Sign-On (SSO) login process, when configured to automatically link sign-ups by email, failed to verify the email address for existing user accounts. This allowed a remote attacker, by controlling an Identity Provider (IdP) identity that asserts a victim's email, to bind to and authenticate as the victim's account. This could lead to account takeover, enabling access to encrypted vault data and potentially escalating privileges within an organization.
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Description OSIDB Bzimport 2026-07-15 16:01:36 UTC 
Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.36.0, Vaultwarden's SSO login flow checked the IdP email_verified claim only for new-user creation and not when SSO_SIGNUPS_MATCH_EMAIL=true linked an IdP identity to an existing local account, allowing an attacker-controlled IdP identity asserting a victim email address to bind to and authenticate as that account. This issue is fixed in version 1.36.0.