CVE-2026-7881 MEDIUM

CVE-2026-7881: Concrete CMS 9.5.0 and below is vulnerable to IDOR in the Express Entry Detail block

Vendor Concrete Cms

Product Concrete CMS

Weakness CWE-639 · IDOR

Published May 21, 2026

Last update May 22, 2026

View on NVD All CVEs

CVSS base score

6.3/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality —

Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 21, 2026 CVE published

May 22, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-7881 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/639.html