# CVE-2026-45808: OpenBao authorization bypass in sys/revoke and sys/renew endpoints

Source: https://junglewise.ai/threats/cve-2026-45808-openbao-authorization-bypass-in-sys-revoke-and-sys-renew  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-28. Updated: 2026-05-28  
License: CC BY 4.0 with a link back

CVE-2026-45808 · Severity: high · CVSS 4 · Published 2026-05-28

OpenBao is a security tool used to manage secrets and credentials across different isolated environments or 'namespaces'. A vulnerability in its legacy management interface allows a user in one environment to revoke or renew credentials belonging to a different environment if they obtain the relevant identifiers. This could lead to service disruptions or unauthorized credential extensions, undermining the security boundaries between different teams or tenants.

Technologies: [github.com/openbao/openbao (Go)](https://junglewise.ai/threats/technologies/github-com-openbao-openbao), [OpenBao](https://junglewise.ai/threats/technologies/openbao). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [OpenBao](https://junglewise.ai/threats/vendors/openbao).

## Quick answers

**Is CVE-2026-45808 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-45808 being exploited in the wild.

**How severe is CVE-2026-45808?** High severity, with a CVSS score of 4, published 28 May 2026.

**Which products and versions are affected?** github.com/openbao/openbao (Go) <= 2.5.3, SEMVER:introduced=0, SEMVER:introduced=0,fixed=2.5.4; OpenBao <= 2.5.3.

**Is there a fix for CVE-2026-45808?** Yes. github.com/openbao/openbao (Go): upgrade to 2.5.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-45808 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-45808?** Check whether you run github.com/openbao/openbao (Go) or OpenBao at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/openbao/openbao (Go): upgrade to 2.5.4 or later

  ```sh
  go get github.com/openbao/openbao@v2.5.4
  ```


## Technical details

An authorization bypass exists in OpenBao's legacy `sys/revoke` and `sys/renew` endpoints. While OpenBao uses namespaces to provide multi-tenant isolation, these undocumented legacy paths do not correctly enforce Access Control List (ACL) boundaries between namespaces. A remote attacker with low privileges who obtains a lease identifier from another tenant can trigger the revocation or renewal of that lease and its associated credentials. This vulnerability is classified as Incorrect Authorization (CWE-863) and is addressed in OpenBao version 2.5.4.

## Affected products

- OpenBao OpenBao <= 2.5.3

## Identifiers

- CVE-2026-45808
- GHSA-v8v8-cm84-m686
- GO-2026-5657

## Timeline

- 2026-05-21: disclosed
- 2026-05-28: advisory: GitHub Advisory published
- 2026-05-28: patched: Version 2.5.4 released

## References

- [https://api.github.com/users/fg0x0](https://api.github.com/users/fg0x0)
- [https://github.com/fg0x0](https://github.com/fg0x0)
- [https://api.github.com/users/fg0x0/gists%7B/gist_id%7D](https://api.github.com/users/fg0x0/gists%7B/gist_id%7D)
- [https://api.github.com/users/fg0x0/repos](https://api.github.com/users/fg0x0/repos)
- [https://avatars.githubusercontent.com/u/35772301?v=4](https://avatars.githubusercontent.com/u/35772301?v=4)
- [https://api.github.com/users/fg0x0/events%7B/privacy%7D](https://api.github.com/users/fg0x0/events%7B/privacy%7D)

## Related threats

- [OpenBao policy cache incorrect authorization via namespace traversal](https://junglewise.ai/threats/cve-2026-115365-openbao-from-2-3-0-before-2-6-3-contains-an-incorrect)
- [OpenBao ACL bypass in policy denial evaluation](https://junglewise.ai/threats/cve-2026-115361-openbao-before-2-6-3-contains-an-acl-bypass-vulnerability-that)
- [OpenBao Kubernetes Auth token renewal on revoked credentials](https://junglewise.ai/threats/cve-2026-115356-openbao-before-2-6-4-and-2-7-x-before-2-7-1-does-not-verify-when)
- [OpenBao Agent information disclosure via stdout in exec rendering mode](https://junglewise.ai/threats/cve-2026-77285-openbao-agent-information-disclosure-via-stdout-in-exec-rendering)
- [OpenBao recovery mode timing attack token leakage](https://junglewise.ai/threats/cve-2026-63132-openbao-recovery-mode-timing-attack-token-leakage)