HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-8134 — Concrete CMS 9.5.0 and below fails to sanitize path traversal sequences in the p...

·Source: NIST NVD

Updated:

Executive Summary

Concrete CMS 9.5.0 and below fails to sanitize path traversal sequences in the ptComposerFormLayoutSetControlCustomTemplate field when saving page type composer form layouts. An authenticated rogue administrator with composer form editing rights can exploit this to include arbitrary readable files on the server. Combined with the file uploader's extension-only validation (which permits PHP code in

Analysis

Concrete CMS 9.5.0 and below fails to sanitize path traversal sequences in the ptComposerFormLayoutSetControlCustomTemplate field when saving page type composer form layouts. An authenticated rogue administrator with composer form editing rights can exploit this to include arbitrary readable files on the server. Combined with the file uploader's extension-only validation (which permits PHP code in files saved with image extensions like .png), this can result in authenticated remote code execution. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 9.4 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H Thanks Yonatan Drori (Tenzai) for reporting. CVSS Score: 7.2. Published: 2026-05-21T21:16:32.837.

Indicators of Compromise (1)

CVE (1)
CVE-2026-8134
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on May 21, 2026. Verified by: NIST.

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