CVE-2026-43911: Vaultwarden is a Bitwarden-compatible server written in Rust

Q: How do I fix CVE-2026-43911?

vaultwarden: upgrade to 1.35.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-43911 being exploited?

CVE-2026-43911 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-43911 affect?

CVE-2026-43911 affects vaultwarden. Severity is medium (CVSS 6.8). 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, em

Q: How urgent is CVE-2026-43911?

Priority 32/100. Public exploit reference

Routine

MEDIUM 6.8UPGRADE

CVE-2026-43911 is a medium-severity flaw (CVSS 6.8) affecting vaultwarden. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 th

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-613
Published	2026-05-11
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: dani-garcia

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-11 23:20 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

dani-garcia vaultwarden UPGRADE

Affected: < 1.35.5

Fixed in: 1.35.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy vaultwarden || rpm -q vaultwarden || vaultwarden --version

2. UPGRADE to 1.35.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade vaultwarden

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vaultwarden

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-43911?

vaultwarden: upgrade to 1.35.5. Exact commands for each OS are on this page.

Is CVE-2026-43911 being exploited?

CVE-2026-43911 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-43911 affect?

CVE-2026-43911 affects vaultwarden. Severity is medium (CVSS 6.8). 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, em

How urgent is CVE-2026-43911?

Priority 32/100. Public exploit reference

Related CVEs

CVE-2026-43912 HIGH 8.7 UPGRADE Vaultwarden is a Bitwarden-compatible server written in Rust
CVE-2026-43914 HIGH 7.3 UPGRADE Vaultwarden is a Bitwarden-compatible server written in Rust
CVE-2026-43913 HIGH 8.1 UPGRADE Vaultwarden is a Bitwarden-compatible server written in Rust

References

← Back to latest CVEs