CVE-2026-43911: Vaultwarden: Refresh tokens not invalidated on security stamp rotation

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-11 · updated 2026-10-26
Weakness: CWE-613

Description

Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.5, refresh tokens are not invalidated when the user's security_stamp is rotated by some security-sensitive operations (password change, KDF change, key rotation, email change, org admin password reset, emergency access takeover). This allows an attacker holding a previously obtained refresh token to maintain session access even after the user has taken action to secure their account. This vulnerability is fixed in 1.35.5.

Affected products

dani-garcia vaultwarden: before 1.35.5 — fixed in 1.35.5

How to fix

Upgrade to a fixed version: dani-garcia vaultwarden 1.35.5. Check the vendor advisory for mitigations.

References

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