CVE-2026-33758
OpenBao has Reflected XSS in its OIDC authentication error message
- State
- Published
- Severity
- 9.4 Critical
- Published
- Mar 27, 2026
- Updated
- Jul 15, 2026
- Reserved
- Mar 23, 2026
Description
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`.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.4 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H | GitHub_M |
| 3.1 | 9.6 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
openbaoopenbao |
|
References
- https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59
- https://github.com/openbao/openbao/pull/2709
- https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662
- https://github.com/openbao/openbao/releases/tag/v2.5.2
- https://access.redhat.com/security/cve/CVE-2026-33758vdb-entry
- RHBZ#2452294issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33758.json
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