CVE-2026-33758
OpenBao has Reflected XSS in its OIDC authentication error message
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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`.
| CWE | CWE-20 CWE-79 CWE-116 |
| Vendor | openbao |
| Product | openbao |
| Published | Mar 27, 2026 |
| Last Updated | Mar 27, 2026 |
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Affected Versions
openbao / openbao
< 2.5.2
References
github.com: https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59 github.com: https://github.com/openbao/openbao/pull/2709 github.com: https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662 github.com: https://github.com/openbao/openbao/releases/tag/v2.5.2