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.
Scoring
- Severity
- CRITICAL
- CVSS base score
- 9.6
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
- EPSS probability
- 0.41%
- CWE
- CWE-384
- Published
- 2026-03-27
- Last modified
- 2026-07-15
Affected products
- openbao openbao
Weakness type
Related vulnerabilities
- CVE-2026-64857 — tirreno has Session Fixation in Login Authentication
- CVE-2026-86674 — ningzichun Student Management System login.php session_start session fixiation
- CVE-2026-76196 — Photoshop Mobile | Session Fixation (CWE-384)
- CVE-2026-86279 — SourceCodester Syllabus-Aligned Learning Management & Examination System Login auth_process.php session fixiation
- CVE-2026-85238 — Session Fixation in MISP CustomAuth Authentication Allows Session Hijacking
- CVE-2026-18527 — IBM Application Runtime Expert (ARE) for IBM i is vulnerable to a user gaining elevated privileges and sensitive information [, ].
- CVE-2026-81826 — Flowintel Fails to Invalidate Active Sessions After Password Change
- CVE-2026-70594 — Ghost: Session Fixation in Ghost Admin