{"id":"CVE-2026-76834","title":"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","summary":"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…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-502"],"vendor":"b2evolution","product":"b2evolution CMS","affected":["cms >= 6.7.8 <= 7.2.5"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:13.703","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-76834","references":[{"url":"https://b2evolution.net/news/2022/03/26/2022-update-eol","label":"disclosure@vulncheck.com"},{"url":"https://gist.github.com/axg11/3e29501c33f6e1e05ac2a00107afd64e","label":"disclosure@vulncheck.com"},{"url":"https://github.com/b2evolution/b2evolution","label":"disclosure@vulncheck.com"},{"url":"https://github.com/b2evolution/b2evolution/blob/7.2.5/htsrv/call_plugin.php#L49","label":"disclosure@vulncheck.com"},{"url":"https://github.com/b2evolution/b2evolution/blob/7.2.5/inc/_core/_param.funcs.php#L2860","label":"disclosure@vulncheck.com"},{"url":"https://github.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f9039509710b37ee2c4d","label":"disclosure@vulncheck.com"},{"url":"https://github.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889f8100ebd1bb","label":"disclosure@vulncheck.com"},{"url":"https://github.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55432fc74cd27","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/b2evolution-cms-6.7.8-through-7.2.5-object-injection-via-negative-integer-array-key","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-18T18:04:36.961014Z"},"epss":0.00847,"epssPercentile":0.56529,"ingestedAt":"2026-09-17T16:21:47.710Z","slug":"CVE-2026-76834","body":"## Overview\n\nb2evolution 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}