OpenBao has Reflected XSS in its OIDC authentication error message
### 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`.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-33758US | medium6.1 | — | ||
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 wit… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/openbao/openbaoPACKAGE
- https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662WEB
- https://github.com/openbao/openbao/pull/2709WEB
- https://github.com/openbao/openbao/releases/tag/v2.5.2WEB
- https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33758ADVISORY
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