---
title: "CVE-2026-76834: b2evolution CMS - Insecure Deserialization"
description: "b2evolution CMS 6.7.8 through 7.2.5 contains an insecure deserialization vulnerability caused by improper validation of serialized-array objects in param_check_serialized_array(), letting unauthenticated attackers instantiate arbitrary PHP objects via crafted POST requests to htsrv/call_plugin.php, potentially enabling code execution if suitable POP gadget chains exist."
url: https://panop.io/threat-heartbeat/CVE-2026-76834/
---

# CVE-2026-76834 b2evolution CMS - Insecure Deserialization

b2evolution CMS 6.7.8 through 7.2.5 contains an insecure deserialization vulnerability caused by improper validation of serialized-array objects in param\_check\_serialized\_array(), letting unauthenticated attackers instantiate arbitrary PHP objects via crafted POST requests to htsrv/call\_plugin.php, potentially enabling code execution if suitable POP gadget chains exist.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.85% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76834)

## Details

Type

Insecure Deserialization

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

17 September 2026

Updated

15 October 2026

Weakness

[CWE-502](https://cwe.mitre.org/data/definitions/502.html)

## Vendor fix

Update to a version later than 7.2.5 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-76834](https://nvd.nist.gov/vuln/detail/CVE-2026-76834)
- [https://b2evolution.net/news/2022/03/26/2022-update-eol](https://b2evolution.net/news/2022/03/26/2022-update-eol)
- [https://github.com/b2evolution/b2evolution](https://github.com/b2evolution/b2evolution)
- [https://github.com/b2evolution/b2evolution/blob/7.2.5/inc/\_core/\_param.funcs.php#L2860](https://github.com/b2evolution/b2evolution/blob/7.2.5/inc/_core/_param.funcs.php#L2860)
- [https://github.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f9039509710b37ee2c4d](https://github.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f9039509710b37ee2c4d)
- [https://www.vulncheck.com/advisories/b2evolution-cms-6.7.8-through-7.2.5-object-injection-via-negative-integer-array-key](https://www.vulncheck.com/advisories/b2evolution-cms-6.7.8-through-7.2.5-object-injection-via-negative-integer-array-key)
- [https://gist.github.com/axg11/3e29501c33f6e1e05ac2a00107afd64e](https://gist.github.com/axg11/3e29501c33f6e1e05ac2a00107afd64e)
- [https://github.com/b2evolution/b2evolution/blob/7.2.5/htsrv/call\_plugin.php#L49](https://github.com/b2evolution/b2evolution/blob/7.2.5/htsrv/call_plugin.php#L49)
- [https://github.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889f8100ebd1bb](https://github.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889f8100ebd1bb)
- [https://github.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55432fc74cd27](https://github.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55432fc74cd27)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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