CVE-2026-33757Critical· 9.6▾ MidnightOpenBao lacks user confirmation for OIDC direct callback mode
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 52.8 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 27.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.4%
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.
github.com/openbao/openbao < 0.0.0-20260325142553-e32103951925Upgrade to a patched release:
github.com/openbao/openbao 0.0.0-20260325142553-e32103951925Connected by shared product, vendor, weakness, or advisory.
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