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Vulnerability record · CVE-2026-33757 · published 27 March 2026

CVE-2026-33757: Openbao vulnerability

Openbao · Openbao

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.

8.3 CVSS 3.1 High EPSS 0.61% · top 53.1% CWE-384 · CWE-384
8.3CVSS 3.1 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
15 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://datatracker.ietf.org/doc/html/rfc8628#section-5.4 Technical Description
https://github.com/openbao/openbao/commit/e32103951925723e9787e33886ab6b6ec20f4964 Patch
https://github.com/openbao/openbao/security/advisories/GHSA-7q7g-x6vg-xpc3 Vendor 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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-33757), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.