CVE-2026-27898: Vaultwarden has Unauthorized Access via Partial Update API on Another User’s Cipher

CVE-2026-27898 · Severity: low · CVSS 3.1 · Published 2026-03-04

Vaultwarden has Unauthorized Access via Partial Update API on Another User’s Cipher

Technologies: vaultwarden (crates.io). Vendors: crates.io.

Quick answers

Is CVE-2026-27898 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-27898 being exploited in the wild.
How severe is CVE-2026-27898?
Low severity, with a CVSS score of 3.1, published 4 March 2026.
Which products and versions are affected?
vaultwarden (crates.io) SEMVER:introduced=0,fixed=1.35.4.
Is there a fix for CVE-2026-27898?
Yes. vaultwarden (crates.io): upgrade to 1.35.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-27898?
Check whether you run vaultwarden (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • vaultwarden (crates.io): upgrade to 1.35.4 or later
    cargo update -p vaultwarden

Affected products

  • vaultwarden (crates.io) SEMVER:introduced=0,fixed=1.35.4

Identifiers

  • CVE-2026-27898
  • GHSA-w9f8-m526-h7fh

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