TI-2026-22242 Aliases CVE-2026-27898 GHSA-w9f8-m526-h7fh

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

LOW 24CWE-639Published 2026-03-04 · Updated 2026-03-05

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00192 8th percentileScored 2026-11-07

Fix Fixed vaultwarden (dani-garcia): 1.35.4vaultwarden (crates.io): 1.35.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
dani-garcia	vaultwarden	before 1.35.4	1.35.4	Patch available	CNA
—	vaultwarden (crates.io)	before 1.35.4	1.35.4	Patch available	GHSA-w9f8-m526-h7fh

vaultwarden Vendordani-garcia Affected before 1.35.4 Fixed in 1.35.4 Patch available CNA
vaultwarden (crates.io) Vendor— Affected before 1.35.4 Fixed in 1.35.4 Patch available GHSA-w9f8-m526-h7fh

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:dani-garcia:vaultwarden::::::::	before 1.35.4	Vulnerable	dani-garcia

cpe:2.3:a:dani-garcia:vaultwarden:*:*:*:*:*:*:*:* Versions before 1.35.4 Vulnerable ·dani-garcia

Remediation

Fix · CNA vaultwarden (dani-garcia) Fixed in 1.35.4
Fix · GHSA-w9f8-m526-h7fh vaultwarden (crates.io) Fixed in 1.35.4 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-27898
2026-10-03 Alias added: GHSA-w9f8-m526-h7fh

References

Advisory 1

https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-w9f8-m526-h7fh

Other 1

https://github.com/dani-garcia/vaultwarden

TI-2026-31977 Vaultwarden: Brute-force protection bypass vulnerability CVSS 3.1CRITICAL 9.8
TI-2026-31975 Vaultwarden: Cross-Org Group Binding Enables Unauthorized Read And Write Access Into Another Organization CVSS 3.1HIGH 8.7
TI-2026-31974 Vaultwarden: Refresh tokens not invalidated on security stamp rotation CVSS 3.1HIGH 8.1
TI-2025-18108 vaultwarden allows escalation of privilege via variable confusion in OrgHeaders trait CVSS 3.1HIGH 8.1
TI-2025-18107 vaultwarden allows RCE in the admin panel CVSS 3.1HIGH 7.2
TI-2026-22155 Vaultwarden: 2FA Bypass on Protected Actions due to Faulty Rate Limit Enforcement CVSS 4.0MEDIUM 6.0

See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences