Input validation error in OpenBao - #VU152258
Published: September 25, 2026
Vulnerability identifier: #VU152258
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to obtain a certificate containing non-validated subject alternative names.
The vulnerability exists due to improper input validation in the PKI ACME certificate issuance functionality when handling ACME certificate requests. A remote attacker can validate an allowed domain and request a certificate containing non-validated subject alternative names to obtain a certificate containing non-validated subject alternative names.
Exploitation requires the PKI ACME feature to be enabled and configured, and the non-validated subject alternative names must be of a type that is not issuable through ACME, such as email addresses.
Affected software
OpenBao
Remediation
Install security update from vendor's website.
OpenBao - addressed in versions 2.6.3, 2.7.0