PT-2026-42561 · Unknown · Concrete Cms

Tristan Madani · Published 2026-05-21 · Updated 2026-05-22 · CVE-2026-8239

Positive Technologies (AI Summary)

CVSS v4.0

6.3

Medium

Base vector

AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.1

Description An Insecure Direct Object Reference (IDOR) exists where the '/ccm/frontend/conversations/get rating' endpoint confirms the existence of and returns the rating score for any message by ID. IDOR is a type of access control flaw that occurs when an application uses user-supplied input to access objects directly.

Recommendations Update to a version newer than 9.5.0. As a temporary workaround, restrict access to the '/ccm/frontend/conversations/get rating' endpoint to minimize the risk of exploitation.

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-8239

Affected Products

Concrete Cms

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-8239 · Security Note
• https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes · Note
• https://t.me/CVEtracker/54558 · Telegram Post