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

Source: https://junglewise.ai/threats/cve-2026-27898-vaultwarden-has-unauthorized-access-via-partial-update-api-on  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-04  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/crates-io-vaultwarden). Vendors: [crates.io](https://junglewise.ai/threats/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

  ```sh
  cargo update -p vaultwarden
  ```


## Affected products

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

## Identifiers

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

## Related threats

- [Vaultwarden's Collection Management Operations Allowed Without `manage` Verification for Manager Role](https://junglewise.ai/threats/cve-2026-27803-vaultwarden-s-collection-management-operations-allowed-without)
- [Vaultwarden has Privilege Escalation via Bulk Permission Update to Unauthorized Collections by Manager](https://junglewise.ai/threats/cve-2026-27802-vaultwarden-has-privilege-escalation-via-bulk-permission-update)
- [Vaultwarden has 2FA Bypass on Protected Actions due to Faulty Rate Limit Enforcement](https://junglewise.ai/threats/cve-2026-27801-vaultwarden-has-2fa-bypass-on-protected-actions-due-to-faulty)
- [Vaultwarden HTML injection vulnerability](https://junglewise.ai/threats/cve-2024-55224-vaultwarden-html-injection-vulnerability)
- [Vaultwarden vulnerable to user impersonation](https://junglewise.ai/threats/cve-2024-55225-vaultwarden-vulnerable-to-user-impersonation)