Missing Authentication for Critical Function in Vault Enterprise and Vault - CVE-2026-5807
Published: April 17, 2026
Vulnerability identifier: #VU126408
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-5807
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper access control in the sys/rekey, sys/generate-root, and sys/rekey-recovery-key endpoints when handling unauthenticated root token generation or rekey requests. A remote attacker can repeatedly initiate or cancel operations to cause a denial of service.
The issue can occupy the single in-progress operation slot and prevent legitimate operators from completing these workflows.
Affected software
Vault Enterprise
Vault
Vault
How to mitigate CVE-2026-5807
Install security update from vendor's website.
Vault Enterprise - addressed in versions 1.19.16, 1.20.10, 1.21.5, 2.0.0
Vault - update to 2.0.0
Vault - update to 2.0.0