CVE-2026-76834

b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key

Published Sep 17, 2026 CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key
First Time appeared B2evolution
B2evolution b2evolution Cms
Weaknesses CWE-502
CPEs cpe:2.3:a:b2evolution:b2evolution_cms:*:*:*:*:*:*:*:*
Vendors & Products B2evolution
B2evolution b2evolution Cms
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.2, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 18, 2026, 6:04 PM
Reserved
Aug 19, 2026, 8:34 PM
Status
Deferred
Published
Sep 17, 2026, 4:17 PM
Modified
Sep 23, 2026, 5:17 PM