CVE-2026-7881

Concrete CMS 9.5.0 and below is vulnerable to IDOR in the Express Entry Detail block

State: Published
Severity: 6.3 Medium
Published: May 21, 2026
Updated: May 22, 2026
Reserved: May 5, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.3 Medium	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	ConcreteCMS

Weaknesses

CWE-639 Authorization bypass through User-Controlled key

Affected Products

Product	Versions
Concrete CMSConcrete CMS	5.0 to before 9.5.0Affected

References

https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notesrelease-notes

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