CVE-2026-45808: OpenBao's cross-namespace lease revocation via legacy sys/revoke path bypasses ACL

Severity: high (CVSS 7.1 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-07 · updated 2026-09-09
Weakness: CWE-863

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.

Affected products

openbao: before 2.5.4

References

https://github.com/openbao/openbao/commit/c0495646b41cea0e3f5a1030132e9cf5c2375b5c
https://github.com/openbao/openbao/pull/3152
https://github.com/openbao/openbao/releases/tag/v2.5.4
https://github.com/openbao/openbao/security/advisories/GHSA-v8v8-cm84-m686

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