Unauthorized Data Exposure in Vaultwarden Server by Bitwarden
CVE-2026-27898

5.4MEDIUM

Key Information:

Vendor

Dani-garcia

Status
Vaultwarden
Vendor
CVE Published:
4 March 2026

What is CVE-2026-27898?

Vaultwarden, an unofficial server compatible with Bitwarden, has a vulnerability that allows authenticated users to manipulate another user’s cipher data through an insecure API endpoint. Although access to the cipher data is denied via the standard retrieval API, this flaw allows partial updates to expose sensitive information such as names, notes, and secured data. The vulnerability has been addressed in version 1.35.4, emphasizing the importance of keeping software up to date to prevent unauthorized data exposure.

Affected Version(s)

vaultwarden < 1.35.4

References

https://github.com/dani-garcia/vaultwarden/security/advis...
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CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.