CVE-2026-33758 | THREATINT

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`.

PUBLISHED Reserved 2026-03-23 | Published 2026-03-27 | Updated 2026-03-27 | Assigner GitHub_M

CRITICAL: 9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Problem types

CWE-20: Improper Input Validation

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-116: Improper Encoding or Escaping of Output

Product status

< 2.5.2

affected

References

github.com/...penbao/security/advisories/GHSA-cpj3-3r2f-xj59

github.com/openbao/openbao/pull/2709

github.com/...ommit/6e2b2dd84f0e47cebc90d6e79609dd5274732662

github.com/openbao/openbao/releases/tag/v2.5.2

cve.org (CVE-2026-33758)

nvd.nist.gov (CVE-2026-33758)

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