CVE-2026-7881

🔶 medium

Summary

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 Score

4.3

Medium

EPSS Score

0.2

Exploit Probability

Published Date

2026-05-21

First Seen: 2026-05-22

📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 5.3% of all 349,476 vulnerabilities in our database.

#330,827

Below average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: May 22, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Partial

Limited system impact

🏆 Discovered By

Tristan Madani

SSVC data provided by CISA

Last Modified 2026-07-23

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS Vector 4.0

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE IDs (Weakness Types)

CWE-639

📦 Affected Products 1

Vendor	Product	Status	Affected Versions
concretecms	concrete_cms	Affected	< 9.5.1

🔗 References 1

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-8340	🔶 medium	4.3	0.1	Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\File::approveVersion. Victim with edit_file_contents p...	2026-05-22
CVE-2026-8347	🔶 medium	4.3	0.2	Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-authorization-level in the Express association Reorder dialog...	2026-05-22
CVE-2026-8353	🔶 medium	4.8	0.2	Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XSS via page name in the Atomik theme. A rogue editor can inj...	2026-05-22
CVE-2026-6826	🔶 medium	5.3	0.3	Concrete CMS 9.5.0 and below is vulnerable to unauthenticated file usage disclosure via missing permission check in t...	2026-05-21
CVE-2026-8134	⚠️ high	7.2	0.7	Concrete CMS 9.5.0 and below fails to sanitize path traversal sequences in the ptComposerFormLayoutSetControlCustomTempl...	2026-05-21
CVE-2026-8135	⚠️ high	7.2	0.5	Concrete CMS 9.5.0 and below is vulnerable to Remote Code Execution due to insecure deserialization occurring in the E...	2026-05-21

These CVEs affect the same products