{"id":"CVE-2026-76834","summary":"b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key","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.","modified":"2026-09-18T03:48:29.831322071Z","published":"2026-09-17T15:16:50.748Z","database_specific":{"cwe_ids":["CWE-502"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76834.json","cna_assigner":"VulnCheck"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/b2evolution/b2evolution","events":[{"introduced":"baf4c9d1245b0149dca900b50e812b059c011b31"},{"last_affected":"a7920fa31b433793ff59c14f70e6f01f613f595f"}],"database_specific":{"extracted_events":[{"introduced":"6.7.8"},{"last_affected":"7.2.5"}],"source":"AFFECTED_FIELD"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-76834.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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"}]}