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`.

• CWE-20
• CWE-79
• CWE-116
• CWE-79

• https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662Patch
• https://github.com/openbao/openbao/pull/2709Issue Tracking, Patch
• https://github.com/openbao/openbao/releases/tag/v2.5.2Product, Release Notes
• https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59Vendor Advisory
• 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

Published

Mar 27, 2026

Last Modified

Jul 15, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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