CVE-2026-8239 Details
Description
Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/get_rating' endpoint confirms existence and returns rating score for any message by ID. 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 Tristan Madani for reporting.
An Insecure Direct Object Reference (IDOR) vulnerability has been identified in Concrete CMS versions through 9.5.0. The issue arises in the '/ccm/frontend/conversations/get_rating' endpoint, which allows users to confirm the existence of messages and retrieve their rating scores by message ID. This vulnerability could be exploited to access and manipulate conversation ratings without proper authorization.
Users can upgrade to Concrete CMS version 9.5.1 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes | ConcreteCMS | Release Notes |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-862 | Missing Authorization | ConcreteCMS |
Affected Products
| Product | Versions |
|---|---|
| concretecms concrete cms | < 9.5.1 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | ConcreteCMS |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 26, 2026 | Initial Analysis | [email protected] |
| May 21, 2026 | New CVE Received | ConcreteCMS |