Is CVE-2026-43911 actively exploited?

No active exploitation of CVE-2026-43911 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-43911 be exploited remotely?

Yes. CVE-2026-43911 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-43911?

CVE-2026-43911 has a CVSS score of 8.1 (HIGH).

HOME VULNERABILITIESCVE-2026-43911

HIGH

CVE-2026-43911

CWE-613Published: May 11, 2026· Updated: May 18, 2026

8.1

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-43911 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.1.