CVE-2026-8347— Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-authorization-level in Express association Reorder dialog
Possible ATT&CK Techniques 3AI
T1059 · Command and Scripting Interpreter T1098 · Account Manipulation T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Concrete CMS | Concrete CMS | 5.0≤ 9.5.0 | affected |
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I. Basic Information for CVE-2026-8347
Vulnerability Information
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Vulnerability Title
Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-authorization-level in Express association Reorder dialog
Source: CVE Program / CVE List V5
Vulnerability Description
Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-authorization-level in the Express association Reorder dialog. This can cause Cross-entity state tampering with view-only permission on one entry. To be affected, a website has to be using express and relying on express entity ordering. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Concrete CMS 安全漏洞
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 9.5.0及之前版本存在安全漏洞，该漏洞源于Express关联重新排序对话框中存在不安全的直接对象引用和错误授权级别，可能导致跨实体状态篡改。
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 | 5.0 ~ 9.5.0 | - |
II. Public POCs for CVE-2026-8347
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Pages for CVE-2026-8347 (1)
- 🔗 9.5.1 Release Notes :: Concrete CMSrelease-notes
Same Patch Batch · Concrete CMS · 2026-05-22 · 3 CVEs total
| CVE-2026-8340 | Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\File::approveVersion | |
| CVE-2026-8353 | Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XSS via page name in atomik them |
IV. Related Vulnerabilities
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- CVE-2026-10721
Concrete CMS below 9.5.2 is vulnerable to PHP Object Injecti - CVE-2026-7888
Concrete CMS below 9.5.2 is vulnerable to PHP Object Injecti - CVE-2026-8353
Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XS - CVE-2026-8340
Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backe - CVE-2026-8139
Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via
Same vendor: Concrete CMS
- CVE-2026-10721
Concrete CMS below 9.5.2 is vulnerable to PHP Object Injecti - CVE-2026-7888
Concrete CMS below 9.5.2 is vulnerable to PHP Object Injecti - CVE-2026-8353
Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XS - CVE-2026-8340
Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backe - CVE-2026-8139
Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via
Same weakness: CWE-639
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V. Comments for CVE-2026-8347
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