CVE-2026-8134

Concrete CMS 9.5.0 and earlier fails to sanitize path traversal in the ptComposerFormLayoutSetControlCustomTemplate field when saving page-type composer form layouts. An authenticated rogue administrator with composer form editing rights can cause arbitrary readable files to be included on the se...

CVE-2026-8134 Concrete CMS 9.5.0 and below is vulnerable to Authenticated RCE via Composer customTemplate Path Traversal leading to PHP File Inclusion

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 file...