{
  "threat_severity" : "Important",
  "public_date" : "2026-03-27T14:12:33Z",
  "bugzilla" : {
    "description" : "OpenBao: reflected XSS in OpenBao OIDC authentication error message",
    "id" : "2452294",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2452294"
  },
  "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-79",
  "details" : [ "OpenBao is an open source identity-based secrets management system. Prior to version 2.5.2, OpenBao installations that have an OIDC/JWT authentication method enabled and a role with `callback_mode=direct` configured are vulnerable to XSS via the  `error_description` parameter on the page for a failed authentication. This allows an attacker access to the token used in the Web UI by a victim. The `error_description` parameter has been replaced with a static error message in v2.5.2. The vulnerability can be mitigated by removing any roles with `callback_mode` set to `direct`.", "A flaw was found in OpenBao. Installations that have an OIDC/JWT authentication method enabled with a role configured to use `callback_mode=direct` are vulnerable to XSS via the `error_description` parameter on the page for a failed authentication. This allows an attacker to access the token used by an authenticated user in the Web UI." ],
  "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-2026-33758\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33758\nhttps://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662\nhttps://github.com/openbao/openbao/pull/2709\nhttps://github.com/openbao/openbao/releases/tag/v2.5.2\nhttps://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59" ],
  "name" : "CVE-2026-33758",
  "mitigation" : {
    "value" : "To mitigate this vulnerability, review JWT/OIDC authentication configurations and remove or disable any roles that have 'callback_mode=direct'.",
    "lang" : "en:us"
  },
  "csaw" : false
}