OpenBao lacks user confirmation for OIDC direct callback mode_CVE-2026-33757

{
    "lastseen": "",
    "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.",
    "published": "2026-03-27T14:10:58.639Z",
    "modified": "2026-04-01T03:55:23.497Z",
    "type": "cve",
    "title": "OpenBao lacks user confirmation for OIDC direct callback mode",
    "source": "GitHub_M",
    "references": "https://github.com/openbao/openbao/security/advisories/GHSA-7q7g-x6vg-xpc3\nhttps://github.com/openbao/openbao/commit/e32103951925723e9787e33886ab6b6ec20f4964\nhttps://datatracker.ietf.org/doc/html/rfc8628#section-5.4",
    "id": "CVE-2026-33757",
    "bulletinFamily": "",
    "cwe": [
        "CWE-384"
    ],
    "cvelist": null,
    "sourceData": "openbao openbao < 2.5.2",
    "sourceHref": "",
    "cvss": {
        "score": 9.6,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "openbao",
    "version": "< 2.5.2",
    "vendor": "openbao",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}