CVE-2026-33757 Details
Description
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.
A vulnerability exists in OpenBao versions prior to 2.5.2, where the application fails to require user confirmation during JWT/OpenID Connect logins via roles with 'callback_mode' set to 'direct'. This oversight enables attackers to initiate authentication requests that, when followed by victims, automatically log them into the attacker's session. Although this process is based on the authorization code flow, the 'direct' mode bypasses standard verification, allowing attackers to continuously poll for OpenBao tokens until they are granted. The issue has been addressed in version 2.5.2, which introduces a mandatory confirmation step for 'direct' logins.
Users can upgrade to OpenBao version 2.5.2, which includes the necessary confirmation step for 'direct' OIDC logins. Alternatively, roles with 'callback_mode=direct' can be removed or the confirmation requirement can be enforced on the token issuer side for the Client ID used by OpenBao.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 31, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-384 | Session Fixation | redhat-SADP |
| CWE-384 | Session Fixation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| openbao openbao | < 2.5.2 |
CPE
Remediation
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Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 30, 2026 | Initial Analysis | [email protected] |
| Mar 27, 2026 | New CVE Received | [email protected] |