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`.
| Vendor | Product | Versions |
|---|---|---|
| openbao | OpenBao | go/github.com/openbao/openbao: < 0.0.0-20260325133417-6e2b2dd84f0e |
Updated product name to OpenBao, changed severity to HIGH, marked as actively exploited, and noted that patch version 2.5.2 is available.
Initial creation
