Is CVE-2026-27898 actively exploited?

No active exploitation of CVE-2026-27898 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27898 be exploited remotely?

Yes. CVE-2026-27898 is exploitable remotely over the network (CVSS attack vector: Network).

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

CVE-2026-27898 has a CVSS score of 5.4 (MEDIUM).

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MEDIUM

CVE-2026-27898

CWE-639Published: March 4, 2026· Updated: Mar 6, 2026

5.4

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:6.6th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-27898 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.