What is CVE-2026-8347?

CVE-2026-8347 is a medium-severity vulnerability in Concrete Cms, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-05-22.

How severe is CVE-2026-8347?

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

Auth bypass in Concrete Cms

CVE-2026-8347

Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-authorization-level in the Express association Reorder dialog. This can cause Cross-entity state tampering with view-only permission on one entry. To be affected, a website has to…

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:N/I:L/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, Vendor Advisory)

Frequently asked questions

What is CVE-2026-8347?: CVE-2026-8347 is a medium-severity vulnerability in Concrete Cms, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-05-22.
How severe is CVE-2026-8347?: Medium severity. CVSS v3 base score is 4.3 out of 10.