{
  "threat_severity" : "Important",
  "public_date" : "2026-03-27T14:10:58Z",
  "bugzilla" : {
    "description" : "OpenBao: lack of user confirmation for OpenBao OIDC direct callback mode",
    "id" : "2452269",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2452269"
  },
  "cvss3" : {
    "cvss3_base_score" : "9.6",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L",
    "status" : "draft"
  },
  "cwe" : "CWE-384",
  "details" : [ "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.", "A flaw was found in OpenBao. A missing prompt for user confirmation when logging in via the JWT/OIDC authentication method with a role configured to use `callback_mode=direct` allows an attacker to initiate an authentication request and perform a \"remote phishing\" attack by tricking an authenticated user into visiting a crafted URL, automatically logging the user into the session of the attacker." ],
  "statement" : "To exploit this vulnerability, an attacker needs to convince a user to visit a crafted URL, limiting the exposure of this flaw. Due to this reason, this issue has been rated with an important severity.",
  "package_state" : [ {
    "product_name" : "Cryostat 4",
    "fix_state" : "Not affected",
    "package_name" : "cryostat/cryostat-storage-rhel9",
    "cpe" : "cpe:/a:redhat:cryostat:4"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-33757\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33757\nhttps://datatracker.ietf.org/doc/html/rfc8628#section-5.4\nhttps://github.com/openbao/openbao/commit/e32103951925723e9787e33886ab6b6ec20f4964\nhttps://github.com/openbao/openbao/security/advisories/GHSA-7q7g-x6vg-xpc3" ],
  "name" : "CVE-2026-33757",
  "mitigation" : {
    "value" : "To mitigate this vulnerability, review JWT/OIDC authentication configurations and remove or disable any roles that have 'callback_mode=direct', or enforce a manual confirmation prompt for every session specifically for the Client ID used by OpenBao.",
    "lang" : "en:us"
  },
  "csaw" : false
}