Vulnerability Description
OpenBao is an open source identity-based secrets management system. Prior to version 2.5.2, OpenBao installations that have an OIDC/JWT authentication method enabled and a role with `callback_mode=direct` configured are vulnerable to XSS via the `error_description` parameter on the page for a failed authentication. This allows an attacker access to the token used in the Web UI by a victim. The `error_description` parameter has been replaced with a static error message in v2.5.2. The vulnerability can be mitigated by removing any roles with `callback_mode` set to `direct`.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openbao | Openbao | < 2.5.2 |
Related Weaknesses (CWE)
References
- https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd52747326Patch
- https://github.com/openbao/openbao/pull/2709Issue TrackingPatch
- https://github.com/openbao/openbao/releases/tag/v2.5.2ProductRelease Notes
- https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59Vendor Advisory
FAQ
What is CVE-2026-33758?
CVE-2026-33758 is a vulnerability with a CVSS score of 6.1 (MEDIUM). OpenBao is an open source identity-based secrets management system. Prior to version 2.5.2, OpenBao installations that have an OIDC/JWT authentication method enabled and a role with `callback_mode=dir...
How severe is CVE-2026-33758?
CVE-2026-33758 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33758?
Check the references section above for vendor advisories and patch information. Affected products include: Openbao Openbao.