Insecure Direct Object Reference in Concrete CMS

Publication date: 2026-05-21

Last updated on: 2026-05-22

Assigner: ConcreteCMS

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-05-21

Last Modified

2026-05-22

Generated

2026-07-02

AI Q&A

2026-05-22

EPSS Evaluated

2026-06-30

NVD

CVE-2026-7881

EUVD

EUVD-2026-31355

Affected Vendors & Products

Vendor	Product	Version / Range
concretecms	concrete_cms	to 9.5.1 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-639	The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

Attack-Flow Graph

Executive Summary

This vulnerability is an Insecure Direct Object Reference (IDOR) found in Concrete CMS version 9.5.0 and below. It occurs in the Express Entry Detail block through the exEntryID parameter. Because of this flaw, an attacker can gain unauthorized access to all Express form submissions.

Impact Analysis

The impact of this vulnerability is that unauthorized users can access sensitive data submitted through Express forms in Concrete CMS. This could lead to exposure of confidential or personal information that was intended to be protected.

Hi! I’m here to help you understand CVE-2026-7881. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70