{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.0.0"
              },
              {
                "last_affected": "1.0.0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0d554e939a315e7f7f18fba3ca1132b80c6a1adb"
            },
            {
              "last_affected": "0d554e939a315e7f7f18fba3ca1132b80c6a1adb"
            }
          ],
          "repo": "https://github.com/cotonti/cotonti",
          "type": "GIT"
        }
      ],
      "versions": [
        "1.0.0"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-502"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91939.json"
  },
  "details": "Cotonti 1.0.0 Comments plugin passes the ci GET parameter to unserialize() without allowed_classes restriction, allowing unauthenticated attackers to instantiate arbitrary PHP classes with attacker-controlled properties. Attackers can exploit PHP object injection through crafted serialized payloads to trigger gadget chains and achieve database manipulation or code execution.",
  "id": "CVE-2026-91939",
  "modified": "2026-09-18T03:30:22.959845022Z",
  "published": "2026-09-15T20:56:45.058Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91939.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91939"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/cotonti-1.0.0-comments-plugin-php-object-injection-via-ci-parameter"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/Cotonti/Cotonti/issues/1888"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Cotonti/Cotonti/pull/1889"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Cotonti/Cotonti"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/comments.setup.php"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/controllers/actions/DisplayAction.php"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/inc/CommentsWidget.php"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Cotonti 1.0.0 Comments Plugin PHP Object Injection via ci Parameter"
}