GHSA-cpj3-3r2f-xj59

OpenBao has Reflected XSS in its OIDC authentication error message

Source: GitHub Advisory Database (reviewed) Critical CVE-2026-33758

Packages

Ecosystem	Package	Affected	Fixed in
Go	github.com/openbao/openbao	< 0.0.0-20260325133417-6e2b2dd84f0e	0.0.0-20260325133417-6e2b2dd84f0e

Details

As written in the advisory (Markdown source, shown as plain text).

### 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`.

References

External links from the advisory. They lead to third-party sites.

https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59 web
https://nvd.nist.gov/vuln/detail/CVE-2026-33758 advisory
https://github.com/openbao/openbao/pull/2709 web
https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662 web
https://github.com/openbao/openbao package
https://github.com/openbao/openbao/releases/tag/v2.5.2 web