{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.12.2"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "fbaf979c3740a6e0f72e3a6c96e4a5102aae2133"
            },
            {
              "fixed": "e4aa2f34e33f9328e8c93514cc3966fc3d99925e"
            }
          ],
          "repo": "https://github.com/cypht-org/cypht",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-502"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71981.json"
  },
  "details": "Cypht before 2.12.2 contains a PHP object injection vulnerability that allows authenticated attackers to execute arbitrary operating system commands by supplying a crafted PHP object graph in the back_query GET parameter of the logout handler. Attackers can pass a base64-encoded serialized payload through this parameter, which is decoded and passed directly to unserialize() without an allow-list, signature check, or type restriction, enabling gadget-chain exploitation to achieve remote code execution as the web server process.",
  "id": "CVE-2026-71981",
  "modified": "2026-09-04T03:30:21.223043537Z",
  "published": "2026-09-01T20:43:08.844Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71981.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/cypht-org/cypht/releases/tag/v2.12.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71981"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/cypht-php-object-injection-rce-via-back-query-parameter"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cypht-org/cypht/pull/2073"
    },
    {
      "type": "FIX",
      "url": "https://github.com/cypht-org/cypht/commit/e4aa2f34e33f9328e8c93514cc3966fc3d99925e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/cypht-org/cypht"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Cypht \u003c 2.12.2 PHP Object Injection RCE via back_query Parameter"
}