GHSA-cpj3-3r2f-xj59 (CVE-2026-33758)

Details

Impact

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.

Patches

The error_description parameter has been replaced with a static error message in v2.5.2

Workarounds

The vulnerability can be mitigated by removing any roles with callback_mode set to direct.

Affected Packages

github.com/openbao/openbao

Go

Fixed in:

0.0.0-20260325133417-6e2b2dd84f0e

References

ADVISORY

https://github.com/advisories/GHSA-cpj3-3r2f-xj59

PACKAGE

https://github.com/openbao/openbao

WEB

https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662

WEB

https://github.com/openbao/openbao/pull/2709

WEB

https://github.com/openbao/openbao/releases/tag/v2.5.2

WEB

https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59

ADVISORY

https://nvd.nist.gov/vuln/detail/CVE-2026-33758