Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
Concrete CMS 9.5.1がCVSS 9.4のパストラバーサルRCEを含む5件の脆弱性を修正(CVE-2026-8134)など https://rocket-boys.co.jp/security-measures-lab/concrete-cms-path-traversal-rce-cve-2026-8134/ #セキュリティ対策Lab #security #securitynews
Post summary
The post announces that Concrete CMS 9.5.1 has released patches for five vulnerabilities, notably a high‑severity path traversal RCE (CVE‑2026‑8134).
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | concretecms | concrete_cms | - | - | - |