Vulnerability · Published Aug 7, 2026 · Assigned by GitHub_M

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

High 7.1

In plain English

A high-severity incorrect authorization in openbao from openbao. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.1High

Exploit odds (30 days)0.4%top 62.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Alpine:v3.23	openbao	2.5.4-r0	ALPINE-CVE-2026-45808
Alpine:v3.24	openbao	2.5.4-r0	ALPINE-CVE-2026-45808
Go	github.com/openbao/openbao	2.5.4	GHSA-v8v8-cm84-m686
Go	github.com/openbao/openbao	no fix listed	GO-2026-5657

Affected products (as reported)

Vendor	Product	Versions
openbao	openbao	< 2.5.4

Weakness: CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

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