Is CVE-2026-8347 actively exploited?

No active exploitation of CVE-2026-8347 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-8347 be exploited remotely?

Yes. CVE-2026-8347 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-8347?

CVE-2026-8347 has a CVSS score of 4.3 (MEDIUM).

HOME VULNERABILITIESCVE-2026-8347

MEDIUM

CVE-2026-8347

CWE-639Published: May 22, 2026· Updated: May 22, 2026

4.3

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.6th

Official Description

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 be using express and relying on express entity ordering. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.

NVD Source

Technical Analysis

CVE-2026-8347 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.