Vaultwarden
CVE-2026-27801
MEDIUM
GHSA-v6pg-v89r-w8wr
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Brute-force prevention, rate limiting
|
| Impact | CVSS 5.9 (MEDIUM). Attack vector: Network. Complexity: High. Privileges required: Low. User interaction: None. Exploitation requires authentication. Public exploit/POC available. |
| Exploit ScenarioDerived | An attacker (requires authentication) could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Two-factor authentication bypass in Vaultwarden 1.34.3 and earlier allows authenticated attackers to circumvent 2FA protections on sensitive operations, enabling unauthorized access to API keys and destructive actions against vaults and organizations. Public exploit code exists for this vulnerability, which affects the unofficial Bitwarden-compatible server and currently lacks an available patch. Attackers with legitimate account credentials can escalate privileges to perform administrative actions typically restricted by 2FA controls.
Earlier versions of this analysis (1)
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. [CVSS 5.9 MEDIUM]
RemediationAI
Fixed in version 1.35.0.. Restrict network access to the affected service where possible.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in cargo
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-307 (Improper Restriction of Excessive Authentication Attempts). Affects Vaultwarden. 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.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
Executive ViewAI
Organizations using Vaultwarden should be aware of moderate risk from CVE-2026-27801 rated CVSS 5.9. Exploitation could compromise the security of affected deployments. Proof-of-concept code is publicly available. Organizations should apply vendor updates when available and monitor for exploitation.
Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
Affected Products (CPE)GitHub Advisory
More in Vaultwarden
View allVaultwarden before 1.35.4 exposes a password-validity oracle at /api/two-factor/send-email-login when server-side email
Cross-organization authorization bypass in Vaultwarden (the Rust-based, self-hosted Bitwarden-compatible server) prior t
Vaultwarden through 1.37.3 permits authenticated users who hold a revoked or not-yet-confirmed organization membership t
Session hijacking via a broken SSO/OAuth authorization flow affects Vaultwarden (the Rust-based Bitwarden-compatible ser
Vaultwarden versions prior to 1.35.4 fail to properly enforce collection management permissions, allowing authenticated
Vaultwarden versions before 1.35.4 contain a privilege escalation vulnerability that allows authenticated Manager-level
Improper authorization in Vaultwarden (self-hosted Bitwarden-compatible server) before 1.35.5 lets an authenticated user
Session persistence in Vaultwarden 1.35.4 and earlier lets a stolen refresh token outlive the account-hardening steps a
Authentication bypass (account takeover) in Vaultwarden before 1.36.0 allows an attacker who controls a federated identi
vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Rated high sev
Vaultwarden's SSO discovery endpoint exposed real organization SSO metadata - including organizationIdentifier values -
Vaultwarden versions prior to 1.35.3 allow authenticated organization members to bypass collection-level access controls
Exploit-DB