{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "6.7.8"
              },
              {
                "last_affected": "7.2.5"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "baf4c9d1245b0149dca900b50e812b059c011b31"
            },
            {
              "last_affected": "a7920fa31b433793ff59c14f70e6f01f613f595f"
            }
          ],
          "repo": "https://github.com/b2evolution/b2evolution",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-502"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76834.json"
  },
  "details": "b2evolution CMS versions 6.7.8 through 7.2.5 contain an incomplete fix for CVE-2016-8901 where the serialized-array object check in param_check_serialized_array() fails to reject payloads with negative integer array keys. Unauthenticated attackers can submit crafted serialized PHP objects via POST requests to htsrv/call_plugin.php that bypass validation and reach unserialize(), instantiating arbitrary PHP objects with attacker-chosen properties that may enable code execution if suitable POP gadget chains exist.",
  "id": "CVE-2026-76834",
  "modified": "2026-09-18T03:30:38.386604272Z",
  "published": "2026-09-17T15:16:50.748Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://b2evolution.net/news/2022/03/26/2022-update-eol"
    },
    {
      "type": "ARTICLE",
      "url": "https://gist.github.com/axg11/3e29501c33f6e1e05ac2a00107afd64e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76834.json"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/b2evolution/b2evolution"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/b2evolution/b2evolution/blob/7.2.5/htsrv/call_plugin.php#L49"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/b2evolution/b2evolution/blob/7.2.5/inc/_core/_param.funcs.php#L2860"
    },
    {
      "type": "FIX",
      "url": "https://github.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f9039509710b37ee2c4d"
    },
    {
      "type": "FIX",
      "url": "https://github.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889f8100ebd1bb"
    },
    {
      "type": "FIX",
      "url": "https://github.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55432fc74cd27"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76834"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/b2evolution-cms-6.7.8-through-7.2.5-object-injection-via-negative-integer-array-key"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key"
}