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

HIGH 7.1CVE-2026-45808 · BIT-openbao-2026-45808 · GHSA-v8v8-cm84-m686 · Published 07/08/2026 · updated 09/09/2026

In short

CVE-2026-45808 is a HIGH (CVSS 7.1) vulnerability affecting github.com/openbao/openbao.
Chance of exploitation in the next 30 days (EPSS): 0.43%, higher than 37.0% of all vulnerabilities.
Fix: update to 2.5.4 or later.

Package	Affected versions	Patched versions
github.com/openbao/openbao Go	`< 2.5.4all versions`	`2.5.4`

Description

Impact

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.

Patch

This will be addressed in v2.5.4.

NVD 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.