What is CVE-2026-7881?

CVE-2026-7881 is a medium-severity vulnerability in Concrete Cms, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-05-21.

How severe is CVE-2026-7881?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Concrete Cms

CVE-2026-7881

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 secu…

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.000 (8.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Concrete Cms — versions 5.0
Concretecms Concrete_cms

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

ff5b8ace-8b95-4078-9743-eac1ca5451de (release-notes, Release Notes)

Frequently asked questions

What is CVE-2026-7881?: CVE-2026-7881 is a medium-severity vulnerability in Concrete Cms, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-05-21.
How severe is CVE-2026-7881?: Medium severity. CVSS v3 base score is 4.3 out of 10.