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CVE-2026-10721— Concrete CMS below 9.5.2 is vulnerable to PHP Object Injection via unserialize() calls in the in Permission, Cache, and Search components

Quick assessment

Affected
Concrete CMS Concrete 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.

Concrete CMS是Concrete CMS开源的一个面向团队的开源内容管理系统。 Concrete CMS 9.5.2之前版本存在代码问题漏洞，该漏洞源于Permission、Cache和Search组件中unserialize调用，可能导致未经身份验证的攻击者触发任意PHP对象实例化。

AI Predicted 9.1 Difficulty: Moderate EPSS 0.15% · P3

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Concrete CMS Concrete CMS 5≤ 9.5.1 affected
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I. Basic Information for CVE-2026-10721

Vulnerability Information
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Vulnerability Title
Concrete CMS below 9.5.2 is vulnerable to PHP Object Injection via unserialize() calls in the in Permission, Cache, and Search components
Source: CVE Program / CVE List V5
Vulnerability Description
Concrete CMS below 9.5.2 is vulnerable to PHP Object Injection via unserialize() calls in the  in Permission, Cache, and Search components. An unauthenticated attacker may trigger arbitrary PHP object instantiation if a malicious serialized payload has been placed in the database. Thanks XananasX7 for reporting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Concrete CMS 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Concrete CMS是Concrete CMS开源的一个面向团队的开源内容管理系统。 Concrete CMS 9.5.2之前版本存在代码问题漏洞，该漏洞源于Permission、Cache和Search组件中unserialize调用，可能导致未经身份验证的攻击者触发任意PHP对象实例化。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Concrete CMS Concrete CMS 5 ~ 9.5.1 -

II. Public POCs for CVE-2026-10721

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III. Intelligence Information for CVE-2026-10721

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Vendor Pages for CVE-2026-10721 (1)

IV. Related Vulnerabilities

Same product: Concrete CMS
Same vendor: Concrete CMS
Same weakness: CWE-502

V. Comments for CVE-2026-10721

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