GHSA-CPJ3-3R2F-XJ59

Vulnerability from github – Published: 2026-03-26 18:37 – Updated: 2026-03-27 21:33
VLAI?
Summary
OpenBao has Reflected XSS in its OIDC authentication error message
Details

Impact

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.

Patches

The error_description parameter has been replaced with a static error message in v2.5.2

Workarounds

The vulnerability can be mitigated by removing any roles with callback_mode set to direct.

Severity ?
9.4 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/openbao/openbao"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260325133417-6e2b2dd84f0e"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33758"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20",
      "CWE-80"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-26T18:37:09Z",
    "nvd_published_at": "2026-03-27T15:16:57Z",
    "severity": "CRITICAL"
  },
  "details": "### Impact\n\nOpenBao 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.\n\nThis allows an attacker access to the token used in the Web UI by a victim.\n\n### Patches\nThe `error_description` parameter has been replaced with a static error message in v2.5.2\n\n### Workarounds\nThe vulnerability can be mitigated by removing any roles with `callback_mode` set to `direct`.",
  "id": "GHSA-cpj3-3r2f-xj59",
  "modified": "2026-03-27T21:33:53Z",
  "published": "2026-03-26T18:37:09Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openbao/openbao/security/advisories/GHSA-cpj3-3r2f-xj59"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33758"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openbao/openbao/pull/2709"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openbao/openbao/commit/6e2b2dd84f0e47cebc90d6e79609dd5274732662"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openbao/openbao"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openbao/openbao/releases/tag/v2.5.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OpenBao has Reflected XSS in its OIDC authentication error message"
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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