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.
Published: 2026-09-17
Score: 9.2 Critical
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Thu, 17 Sep 2026 15:30:00 +0000

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'}

Subscriptions

B2evolution B2evolution Cms
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-17T15:16:50.748Z

Reserved: 2026-08-19T20:34:00.154Z

Link: CVE-2026-76834

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-17T16:17:42.270

Modified: 2026-09-17T16:17:42.270

Link: CVE-2026-76834

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-17T21:15:14Z

Weaknesses
  • CWE-502

    Deserialization of Untrusted Data