{"id":78701,"date":"2026-05-21T23:43:31","date_gmt":"2026-05-21T20:13:31","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/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\/"},"modified":"2026-05-21T23:43:31","modified_gmt":"2026-05-21T20:13:31","slug":"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","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/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\/","title":{"rendered":"CVE-2026-8134 &#8211; Concrete CMS 9.5.0 and below is vulnerable to Authenticated RCE via Composer customTemplate Path Traversal leading to PHP File Inclusion"},"content":{"rendered":"<p>CVE ID :CVE-2026-8134<\/p>\n<p>  Published : May 21, 2026, 8:13 p.m. | 46\u00a0minutes ago<\/p>\n<p>  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&#8217;s extension-only validation (which permits PHP code in files saved with image extensions like .png), this can result in\u00a0authenticated remote code execution.\u00a0The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 9.4 with vector\u00a0CVSS:4.0\/AV:N\/AC:L\/AT:N\/PR:H\/UI:N\/VC:H\/VI:H\/VA:H\/SC:H\/SI:H\/SA:H\u00a0 \u00a0Thanks\u00a0Yonatan Drori\u00a0(Tenzai)\u00a0for reporting.<\/p>\n<p>  Severity: 9.4 | CRITICAL<\/p>\n<p>  Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID :CVE-2026-8134 Published : May 21, 2026, 8:13 p.m. | 46\u00a0minutes ago 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 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-78701","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/78701","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=78701"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/78701\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=78701"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=78701"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=78701"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}