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CVE-2026-76834

8.1 · HIGH

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 nega…

Published Sep 17, 2026CWE-502EPSS 0.85%

Overview

CVE-2026-76834 is a high-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refb2evolution.net/news/2022/03/26/2022-update-eolGitHubgist.github.com/axg11/3e29501c33f6e1e05ac2a00107afd64eGitHubgithub.com/b2evolution/b2evolutionGitHubgithub.com/b2evolution/b2evolution/blob/7.2.5/htsrv/call_plugin.php#L49GitHubgithub.com/b2evolution/b2evolution/blob/7.2.5/inc/_core/_param.funcs.php#L2860GitHubgithub.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f9039509710b37ee2c4dGitHubgithub.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889f8100ebd1bbGitHubgithub.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55432fc74cd27Refwww.vulncheck.com/advisories/b2evolution-cms-6.7.8-through-7.2.5-object-injection-via-negative-integer-array-key

How CyberStrike helps

Frequently asked questions

What is CVE-2026-76834?

CVE-2026-76834 is a high-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-76834?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-76834?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-76834?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-76834 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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