What is the CVSS score of CVE-2026-27898?

CVE-2026-27898 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Vaultwarden are affected by CVE-2026-27898?

Organizations using Vaultwarden should be aware of moderate risk from CVE-2026-27898, a IDOR vulnerability rated CVSS 5.4. Exploitation could compromise the security of affected deployments.. A patch is available.

Vaultwarden CVE-2026-27898

MEDIUM

Authorization Bypass Through User-Controlled Key (CWE-639)

2026-03-04 security-advisories@github.com

GHSA-w9f8-m526-h7fh

Authentication Bypass Vaultwarden Red Hat

5.4

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.4 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Red Hat

6.5 MEDIUM

qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 22:05 vuln.today

CVE Published

Mar 04, 2026 - 22:16 nvd

MEDIUM 5.4

DescriptionGitHub Advisory

Vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Prior to version 1.35.4, an authenticated regular user can specify another user’s cipher_id and call "PUT /api/ciphers/{id}/partial" Even though the standard retrieval API correctly denies access to that cipher, the partial update endpoint returns 200 OK and exposes cipherDetails (including name, notes, data, secureNote, etc.). This issue has been patched in version 1.35.4.

AnalysisAI

Vaultwarden versions up to 1.35.4 is affected by authorization bypass through user-controlled key (CVSS 5.4).

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Vulnerability AssessmentAI

Risk Assessment	CVSS 5.4 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker (requires authentication) could exploit this vulnerability to compromise the affected system.
Remediation	Fixed in version 1.35.4.. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …

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Vendor StatusVendor

CVE-2026-27898 vulnerability details – vuln.today

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