Improper access control in OpenBao - CVE-2026-40264
Published: April 21, 2026
Vulnerability identifier: #VU126698
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-40264
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenBao
Affected software:
OpenBao
OpenBao
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper access control in the token store when handling token renewal or revocation across namespaces. A remote privileged user can renew or revoke a token from another namespace to cause a denial of service.
Exploitation requires a leaked token accessor and affects cross-namespace tenant isolation.
How to mitigate CVE-2026-40264
Install security update from vendor's website.