High severity8.1NVD Advisory· Published Sep 17, 2026
CVE-2026-76834
CVE-2026-76834
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2(expand)+ 1 more
- (no CPE)
- (no CPE)range: 6.7.8 - 7.2.5
Patches
Vulnerability mechanics
References
8- b2evolution.net/news/2022/03/26/2022-update-eolnvd
- gist.github.com/axg11/3e29501c33f6e1e05ac2a00107afd64envd
- github.com/b2evolution/b2evolution/blob/7.2.5/htsrv/call_plugin.phpnvd
- github.com/b2evolution/b2evolution/blob/7.2.5/inc/_core/_param.funcs.phpnvd
- github.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f9039509710b37ee2c4dnvd
- github.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889f8100ebd1bbnvd
- github.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55432fc74cd27nvd
- www.vulncheck.com/advisories/b2evolution-cms-6.7.8-through-7.2.5-object-injection-via-negative-integer-array-keynvd
News mentions
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