CVE-2026-33758
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`.
- Score
- CVSS 3.1 9.6 Critical
- Status
- Modified - security-advisories@github.com
- Published
- 2026-03-27
- Last modified
- 2026-07-15
- Weaknesses
- CWE-116, CWE-20, CWE-79
Affected products
References
- https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662
- https://github.com/openbao/openbao/pull/2709
- https://github.com/openbao/openbao/releases/tag/v2.5.2
- https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59
- https://access.redhat.com/security/cve/CVE-2026-33758
- https://bugzilla.redhat.com/show_bug.cgi?id=2452294
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33758.json
