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Low · 2.3 Public exploit CVE-2026-8347 EUVD-2026-31442GHSA-jqvq-gv67-3567

Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-authorization-level in Express association Reorder dialog

Published May 22, 2026 · Updated May 22, 2026 · Assigned by ConcreteCMS

Vendor: Concrete CMS Product: Concrete CMS Package: concrete5/concrete5 Ecosystem: Packagist

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.

Affected products

VendorProductAffectedFixed
Concrete CMS Concrete CMS — —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • aj2108/CVE-2026-8347 ★ 0 · Jul 31, 2026

    CVE-2026-8347 is an Insecure Direct Object Reference (IDOR) combined with a wrong authorization level vulnerability in Concrete CMS versions 9.5.0 and earlier. The flaw exists in the Express associat…

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist concrete5/concrete5 < 9.5.1 9.5.1 GHSA-jqvq-gv67-3567

References