CVE-2026-76834
CRITICAL
9,2
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A
HIGH
8,1
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Description
AI Translation Available
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.
502
Deserialization of Untrusted Data
DraftCommon Consequences
Security Scopes Affected:
Integrity
Availability
Other
Potential Impacts:
Modify Application Data
Unexpected State
Dos: Resource Consumption (Cpu)
Varies By Context
Applicable Platforms
Languages:
Java, Ruby, PHP, Python, JavaScript
Technologies:
Not Technology-Specific, ICS/OT, AI/ML
https://b2evolution.net/news/2022/03/26/2022-update-eol
https://gist.github.com/axg11/3e29501c33f6e1e05ac2a00107afd64e
https://github.com/b2evolution/b2evolution
https://github.com/b2evolution/b2evolution/blob/7.2.5/htsrv/call_plugin.php#L49
https://github.com/b2evolution/b2evolution/blob/7.2.5/inc/_core/_param.funcs.ph…
https://github.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f90395097…
https://github.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889…
https://github.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55…
https://www.vulncheck.com/advisories/b2evolution-cms-6.7.8-through-7.2.5-object…