CVE-2026-7881: Concretecms Concrete CMS

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Concrete CMS 9.5.0 and below is subject to Insecure Direct Object Reference (IDOR) in the Express Entry Detail block via the exEntryID parameter. This IDOR leads to unauthorized access to all Express form submissions. 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.

Affected products

• Concretecms Concrete CMS: before 9.5.1 (fixed in 9.5.1)

Published 2026-05-21. Last modified 2026-07-23.