CVE-2026-33757

OpenBao is an open source identity-based secrets management system. Prior to version 2.5.2, OpenBao does not prompt for user confirmation when logging in via JWT/OIDC and a role with `callback_mode` set to `direct`. This allows an attacker to start an authentication request and perform "remote phishing" by having the victim visit the URL and automatically log-in to the session of the attacker. Despite being based on the authorization code flow, the `direct` mode calls back directly to the API and allows an attacker to poll for an OpenBao token until it is issued. Version 2.5.2 includes an additional confirmation screen for `direct` type logins that requires manual user interaction in order to finish the authentication. This issue can be worked around either by removing any roles with `callback_mode=direct` or enforcing confirmation for every session on the token issuer side for the Client ID used by OpenBao.

• CWE-384
• CWE-384

• https://datatracker.ietf.org/doc/html/rfc8628#section-5.4Technical Description
• https://github.com/openbao/openbao/commit/e32103951925723e9787e33886ab6b6ec20f4964Patch
• https://github.com/openbao/openbao/security/advisories/GHSA-7q7g-x6vg-xpc3Vendor Advisory
• https://access.redhat.com/security/cve/CVE-2026-33757
• https://bugzilla.redhat.com/show_bug.cgi?id=2452269
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33757.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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