CVE-2026-43912: Vaultwarden is a Bitwarden-compatible server written in Rust

Q: How do I fix CVE-2026-43912?

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

Q: Is CVE-2026-43912 being exploited?

CVE-2026-43912 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-2026-43912 affect?

CVE-2026-43912 affects vaultwarden. Severity is high (CVSS 8.7). Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.5, Vaultwarden does not enforce that a groups_users.users_organizations_uuid entry belongs to the same organization as groups.groups_uuid, or a collections_groups.c

Q: How urgent is CVE-2026-43912?

Priority 41/100. High severity; Public exploit reference

This month

HIGH 8.7UPGRADE

CVE-2026-43912 is a high-severity flaw (CVSS 8.7) 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, Vaultwarden does not enforce that a groups_users.users_organizations_uuid entry belongs to the same organization as groups.groups_uuid, or a collections_groups.collections_uuid entry belongs to the same organization as collections_groups.groups_uuid. Multiple organization group-management endpoints accept arbitrary MembershipId and CollectionId values and persist them

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-285
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-2026-43912?

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

Is CVE-2026-43912 being exploited?

CVE-2026-43912 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-2026-43912 affect?

CVE-2026-43912 affects vaultwarden. Severity is high (CVSS 8.7). Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.5, Vaultwarden does not enforce that a groups_users.users_organizations_uuid entry belongs to the same organization as groups.groups_uuid, or a collections_groups.c

How urgent is CVE-2026-43912?

Priority 41/100. High severity; Public exploit reference

Related CVEs

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
CVE-2026-43911 MEDIUM 6.8 UPGRADE Vaultwarden is a Bitwarden-compatible server written in Rust

References

← Back to latest CVEs