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CVE-2026-76834— b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key

Quick assessment

Affected
b2evolution b2evolution CMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

B2 Evolution CMS 6.7.8 至 7.2.5 版本中存在对 CVE-2016-8901 的修复不完整问题。其中， 函数中的序列化数组对象检查无法拒绝包含负整数数组键的负载。 未认证的 attackers 可以通过向 发送精心构造的 POST 请求，提交由攻击者构造的已序列化 PHP 对象，从而绕过验证并到达 函数，实例化具有攻击者选定属性的任意 PHP 对象。如果存在合适的 POP 小工具链（POP gadget chains），则可能导致代码执行。

CVSS 8.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
b2evolution b2evolution CMS 6.7.8≤ 7.2.5 affected
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I. Basic Information for CVE-2026-76834

Vulnerability Information
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Vulnerability Title
b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
b2evolution b2evolution CMS 6.7.8 ~ 7.2.5 -

II. Public POCs for CVE-2026-76834

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-76834

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Patches & Fixes for CVE-2026-76834 (2)

Vendor Advisories for CVE-2026-76834 (1)

Proof of Concept for CVE-2026-76834 (1)

Vendor Pages for CVE-2026-76834 (1)

IV. Related Vulnerabilities

Same vendor: b2evolution
Same weakness: CWE-502

V. Comments for CVE-2026-76834

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