CVE-2026-27801: Vaultwarden: 2FA Bypass on Protected Actions due to Faulty Rate Limit Enforcement

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-04 · updated 2026-06-17
Weakness: CWE-307

Description

Vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Vaultwarden versions 1.34.3 and prior are susceptible to a 2FA bypass when performing protected actions. An attacker who gains authenticated access to a user’s account can exploit this bypass to perform protected actions such as accessing the user’s API key or deleting the user’s vault and organisations the user is an admin/owner of . This issue has been patched in version 1.35.0.

Affected products

dani-garcia vaultwarden: before 1.35.0 — fixed in 1.35.0

How to fix

Upgrade to a fixed version: dani-garcia vaultwarden 1.35.0. Check the vendor advisory for mitigations.

References

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