High severity · published Aug 7, 2026
CVE-2026-45808
OpenBao's cross-namespace lease revocation via legacy sys/revoke path bypasses ACL
7.1
CVSS
0.4%
EPSS
No
On KEV
Description
OpenBao is an open source identity-based secrets management system. Prior to version 2.5.4, OpenBao's namespaces provide multi-tenant separation. A tenant who intentionally leaks lease identifiers can have their lease and underlying credential revoked or renewed by a user in another tenant via the legacy, undocumented `sys/revoke` and `sys/renew` endpoints. This is fixed in OpenBao v2.5.4.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
openbao · openbao
< 2.5.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45808
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45808
github.com
https://github.com/openbao/openbao/commit/c0495646b41cea0e3f5a1030132e9cf5c2375b5c
github.com
https://github.com/openbao/openbao/pull/3152
github.com
https://github.com/openbao/openbao/releases/tag/v2.5.4
github.com
https://github.com/openbao/openbao/security/advisories/GHSA-v8v8-cm84-m686
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