CVE-2026-43911: Dani-Garcia Vaultwarden

High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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)

Published 2026-05-11. Last modified 2026-06-17.