Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 18.8%
CVSS Severity
CVSS v3 Score 9.6
References
Products affected by CVE-2026-33757
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cpe:2.3:a:openbao:openbao:-
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cpe:2.3:a:openbao:openbao:2.0.0
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cpe:2.3:a:openbao:openbao:2.0.1
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cpe:2.3:a:openbao:openbao:2.0.2
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cpe:2.3:a:openbao:openbao:2.0.3
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cpe:2.3:a:openbao:openbao:2.1.0
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cpe:2.3:a:openbao:openbao:2.1.1
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cpe:2.3:a:openbao:openbao:2.2.0
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cpe:2.3:a:openbao:openbao:2.2.1
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cpe:2.3:a:openbao:openbao:2.2.2
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cpe:2.3:a:openbao:openbao:2.3.0
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cpe:2.3:a:openbao:openbao:2.3.1
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cpe:2.3:a:openbao:openbao:2.3.2
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cpe:2.3:a:openbao:openbao:2.4.0
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cpe:2.3:a:openbao:openbao:2.4.1