CVE-2026-43911
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.22%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.22% probability · 12th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-613
- Affected
- dani-garcia/vaultwarden
- Source
- security-advisories@github.com
References
- https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-6j4w-g4jh-xjfxExploit, Mitigation, Vendor Advisory
- https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-6j4w-g4jh-xjfxExploit, Mitigation, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.