{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.2.13"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "e09c8d3526f3583cb6c3476a021b885088ecd4bd"
            }
          ],
          "repo": "https://github.com/wintercms/winter",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-j5jq-cr68-v2xx"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-285"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35445.json"
  },
  "details": "Winter CMS is a content management system built on the Laravel PHP framework. In versions prior to 1.2.13, the backend did not validate the handler name submitted through the form postback _handler POST field, allowing an authenticated backend user to invoke arbitrary controller methods, including protected, private, and action-prefixed ones. While AJAX requests validate that handler names match the on[A-Z][\\w+]* pattern, the postback path passed the submitted _handler value straight to the handler dispatcher with no such check, so any controller that exposes a public action or conditionally relaxes its $requiredPermissions check could be reached, bypassing the roles and permissions system. The built-in Users controller was affected because it set $requiredPermissions to null for the myaccount action, letting any authenticated backend user invoke user-management methods such as update_onDelete and update_onManualPasswordReset without holding the backend.manage_users permission. This issue is fixed in version 1.2.13.",
  "id": "CVE-2026-35445",
  "modified": "2026-08-28T11:30:34.494876180Z",
  "published": "2026-08-26T16:40:51.500Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/wintercms/winter/releases/tag/v1.2.13"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35445.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/wintercms/winter/security/advisories/GHSA-j5jq-cr68-v2xx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35445"
    },
    {
      "type": "FIX",
      "url": "https://github.com/wintercms/winter/pull/1473"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Winter: Authenticated backend users can bypass Users controller permission checks"
}