CVE-2026-47164: Vaultwarden account takeover via unverified SSO email linking

CVE-2026-47164 · Severity: high · CVSS 7.7 · Published 2026-07-15

Vaultwarden, an open-source password management server, contains a security flaw in its Single Sign-On (SSO) login process. When a specific setting is enabled to link accounts by email address, the system fails to verify if the email address provided by the login provider has actually been verified. This could allow an attacker to create a malicious account on a third-party provider using a victim's email address and use it to take over the victim's existing password vault.

Technologies: Dani-Garcia Vaultwarden. Vendors: Dani-Garcia.

Quick answers

Is CVE-2026-47164 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-47164 being exploited in the wild.
How severe is CVE-2026-47164?
High severity, with a CVSS score of 7.7, published 15 July 2026.
Which products and versions are affected?
Dani-Garcia Vaultwarden < 1.36.0.
Is there a fix for CVE-2026-47164?
A patch was published on 2026-04-29: Fixes merged into main branch via PR #7163 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-47164 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-47164?
Check whether you run Dani-Garcia Vaultwarden at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An improper access control vulnerability exists in Vaultwarden's SSO implementation prior to version 1.36.0. When the configuration 'SSO_SIGNUPS_MATCH_EMAIL=true' is active, the server links incoming IdP identities to existing local accounts based on the email claim without checking the 'email_verified' status. An attacker who can control an IdP identity (or use an IdP that does not enforce email verification) can assert a victim's email address to bind to and authenticate as that local account. While the attacker would still need the Master Password to decrypt vault data, they can successfully authenticate to the account and fetch encrypted blobs. The fix in 1.36.0 ensures the 'email_verified' claim is validated during the account linking process.

Affected products

  • dani-garcia Vaultwarden < 1.36.0

Timeline

  • 2026-04-29: patched: Fixes merged into main branch via PR #7163
  • 2026-05-03: advisory: Version 1.36.0 released with security fixes
  • 2026-07-15: disclosed: CVE-2026-47164 published

References

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