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TI-2026-31974 Aliases CVE-2026-43911

Vaultwarden: Refresh tokens not invalidated on security stamp rotation

Priority HIGH 70CWE-613Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-613.

Summary

Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.5, refresh tokens are not invalidated when the user's security_stamp is rotated by some security-sensitive operations (password change, KDF change, key rotation, email change, org admin password reset, emergency access takeover). This allows an attacker holding a previously obtained refresh token to maintain session access even after the user has taken action to secure their account. This vulnerability is fixed in 1.35.5.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00216 12th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed vaultwarden (dani-garcia): 1.35.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
dani-garciavaultwardenbefore 1.35.51.35.5Patch availableCNA
  • vaultwarden Vendordani-garcia Affected before 1.35.5 Fixed in 1.35.5 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:dani-garcia:vaultwarden:*:*:*:*:*:*:*:*before 1.35.5Vulnerabledani-garcia
  • cpe:2.3:a:dani-garcia:vaultwarden:*:*:*:*:*:*:*:* Versions before 1.35.5 Vulnerable ·dani-garcia

Remediation

  • Fix · CNA vaultwarden (dani-garcia) Fixed in 1.35.5

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-43911

References

Exploit 1

  • 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-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
  • TI-2026-24388 Vaultwarden WebAuthn credential metadata tampered before signature verification CVSS 4.0MEDIUM 5.3
See all 19 →

Sources

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