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CVE-2026-8237— Concrete CMS 9.5.0 and below is vulnerable to IDOR in the`/ccm/frontend/conversations/message_detail` endpoint

Quick assessment

Affected
Concrete CMS Concrete CMS
Exploitation
Public or AI PoC available; prioritize validation
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 9.5.0及之前版本存在安全漏洞，该漏洞源于IDOR，可能导致未授权访问所有对话消息内容及文件附件。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.74% · P53

Public Exploits 1

Nuclei · 1 CVE-2026-8237.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
Concrete CMS Concrete CMS 5.0≤ 9.5.0 affected
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I. Basic Information for CVE-2026-8237

Vulnerability Information
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Vulnerability Title
Concrete CMS 9.5.0 and below is vulnerable to IDOR in the`/ccm/frontend/conversations/message_detail` endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Concrete CMS 9.5.0 and below is vulnerable to IDOR. The `/ccm/frontend/conversations/message_detail` endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and the moderation queue. File attachments with download URLs are also exposed. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with Vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Eldudareeno for reporting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
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IDOR，可能导致未授权访问所有对话消息内容及文件附件。
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-2026-8237

# POC Description Source Link Shenlong Link
1 Concrete CMS <= 9.5.0 contains an IDOR caused by insufficient access control in /ccm/frontend/conversations/message_detail endpoint, letting unauthenticated attackers enumerate conversation messages and attachments. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-8237.yaml POC Details
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III. Intelligence Information for CVE-2026-8237

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Vendor Pages for CVE-2026-8237 (1)

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-2026-8432 Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete
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-2026-8434 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-2026-8327 Concrete CMS below 9.5.0 and below is vulnerable to password change without reauthorizatio
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 &rarr; →

IV. Related Vulnerabilities

Same product: Concrete CMS
Same vendor: Concrete CMS
Same weakness: CWE-862

V. Comments for CVE-2026-8237

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