CVE-2026-8134— Concrete CMS 9.5.0 and below is vulnerable to Authenticated RCE via Composer customTemplate Path Traversal leading to PHP File Inclusion
Possible ATT&CK Techniques 1AI
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-2026-8134
Vulnerability Information
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Vulnerability Title
Concrete CMS 9.5.0 and below is vulnerable to Authenticated RCE via Composer customTemplate Path Traversal leading to PHP File Inclusion
Source: NVD (National Vulnerability Database)
Vulnerability Description
Concrete CMS 9.5.0 and below fails to sanitize path traversal sequences in the ptComposerFormLayoutSetControlCustomTemplate field when saving page type composer form layouts. An authenticated rogue administrator with composer form editing rights can exploit this to include arbitrary readable files on the server. Combined with the file uploader's extension-only validation (which permits PHP code in files saved with image extensions like .png), this can result in authenticated remote code execution. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 9.4 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H Thanks Yonatan Drori (Tenzai) for reporting.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
PHP程序中Include/Require语句包含文件控制不恰当(PHP远程文件包含)
Source: NVD (National Vulnerability Database)
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，该漏洞源于在保存页面类型编辑器表单布局时，未对ptComposerFormLayoutSetControlCustomTemplate字段中的路径遍历序列进行清理，可能导致经过身份验证的恶意管理员利用此漏洞包含服务器上的任意可读文件，结合文件上传器的扩展名验证，可能导致经过身份验证的远程代码执行。
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-2026-8134
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Pages for CVE-2026-8134 (1)
- 9.5.1 Release Notes :: Concrete CMSrelease-notes
Same Patch Batch · Concrete CMS · 2026-05-21 · 41 CVEs total
| CVE-2026-8240 | Concrete CMS 9.5.0 and below is vulnerable to unauthenticated page metadata disclosure in | |
| CVE-2026-8416 | Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete | |
| CVE-2026-8412 | Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete | |
| CVE-2026-8237 | Concrete CMS 9.5.0 and below is vulnerable to IDOR in the`/ccm/frontend/conversations/mess | |
| CVE-2026-8434 | Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete | |
| CVE-2026-8435 | Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete | |
| CVE-2026-8414 | Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete | |
| CVE-2026-8433 | Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete | |
| CVE-2026-8239 | Concrete CMS 9.5.0 and below is vulnerable to IDOR in '/ccm/frontend/conversations/get_rat | |
| CVE-2026-8411 | Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete | |
| CVE-2026-8432 | Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete | |
| CVE-2026-8236 | Concrete CMS 9.5.0 and below is vulnerable to IDOR combined with a missing authentication | |
| CVE-2026-8413 | Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete | |
| CVE-2026-8415 | Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete | |
| CVE-2026-8427 | Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete | |
| CVE-2026-8238 | Concrete CMS 9.5.0 and below is vulnerable to IDOR in '/ccm/frontend/conversations/message | |
| CVE-2026-8245 | Concrete CMS 9.5.0 and below is vulnerable to Reflected XSS in Legacy Pagination via HTML | |
| CVE-2026-7890 | Concrete CMS 9.5.0 is vulnerable to SSRF via RSS Displayer Block | |
| CVE-2026-8139 | Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via external-link page cvName | |
| CVE-2026-8409 | Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete |
Showing top 20 of 41 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Concrete CMS
- CVE-2026-8353
Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XS - CVE-2026-8347
Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-a - 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 - CVE-2026-7890
Concrete CMS 9.5.0 is vulnerable to SSRF via RSS Displayer B
Same vendor: Concrete CMS
- CVE-2026-8353
Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XS - CVE-2026-8347
Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-a - 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 - CVE-2026-7890
Concrete CMS 9.5.0 is vulnerable to SSRF via RSS Displayer B
Same weakness: CWE-98
- CVE-2026-7522
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WordPress Plugin WP with Spritz 1.0 Remote File Inclusion - CVE-2018-25324
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WordPress Plugin Supsystic Backup 2.3.9 Local File Inclusion
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