What is CVE-2026-43911?

CVE-2026-43911 is a medium-severity vulnerability in Dani-garcia Vaultwarden, classified under Insufficient Session Expiration. CVSS score: 6.8/10. Published 2026-05-11.

How severe is CVE-2026-43911?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Dani-garcia Vaultwarden

CVE-2026-43911

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, e…

EPSS: 0.000 (10.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Dani-garcia Vaultwarden — versions < 1.35.5

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-43911?: CVE-2026-43911 is a medium-severity vulnerability in Dani-garcia Vaultwarden, classified under Insufficient Session Expiration. CVSS score: 6.8/10. Published 2026-05-11.
How severe is CVE-2026-43911?: Medium severity. CVSS v3 base score is 6.8 out of 10.