Concrete CMS Cross-Site Request Forgery Vulnerability

Concrete CMS is an open-source content management system designed for teams. Versions of Concrete CMS 9.5.0 and earlier contained a cross-site request forgeing vulnerability. This vulnerability stemmed from the lack of validation on CSRF tokens, which could allow attackers to force administrators...

CVE-2026-8427: Cross-Site Request Forgery (CSRF)

Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery CSRF at concrete/controllers/backend/file removeFavoriteFolder$id. 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:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N...

CVE-2026-8134: Improper Control of Filename for Include/Require Statement in PHP Program

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...

PT-2026-42535

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.1 Description Concrete CMS fails to sanitize path traversal sequences in the ptComposerFormLayoutSetControlCustomTemplate field during the process of saving page type composer form layouts. An authenticated...

CVE-2026-8135: Deserialization of Untrusted Data

Concrete CMS 9.5.0 and below is vulnerable to Remote Code Execution due to insecure deserialization occurring in the ExpressEntryList block controller. An rogue administrator with privileges to add blocks to an area can bypass the intended protection mechanism fromCIF === true, which normally...

CVE-2026-7886: Authorization Bypass Through User-Controlled Key

Concrete CMS 9.5.0 and below is vulnerable to IDOR in AddMessage/UpdateMessage via attachments parameter which can lead to file permission bypass. The AddMessage and UpdateMessage conversation controllers accept user-supplied file attachment IDs and load files directly via $em-findFile::class,...

CVE-2026-6826: Exposure of Sensitive Information to an Unauthorized Actor

Concrete CMS 9.5.0 and below is vulnerable to unauthenticated file usage disclosure via missing permission check in the usage controller. Any unauthenticated visitor can request /ccm/system/dialogs/file/usage/fID with any file ID and receive a list of every page that references that file,...

CVE-2026-7881: Authorization Bypass Through User-Controlled Key

Concrete CMS 9.5.0 and below is subject to Insecure Direct Object Reference IDOR in the Express Entry Detail block via the exEntryID parameter. This IDOR leads to unauthorized access to all Express form submissions. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3...

Concrete CMS security vulnerabilities

Concrete CMS is an open-source content management system designed for teams. Concrete CMS versions 9.5.0 and earlier have a security vulnerability. This vulnerability stems from the submitpassword method bypassing the viewfile permission checks, which may allow unauthorized access to files...

Concrete CMS Cross-Site Request Forgery Vulnerability

Concrete CMS is an open-source content management system designed for teams. Versions of Concrete CMS 9.5.0 and earlier contained a cross-site request forgeing vulnerability. This vulnerability stemmed from the reverse implementation of CSRF token checks in the DeleteFile controller, which could...

CVE-2026-7882: Cross-Site Request Forgery (CSRF)

Concrete CMS 9.5.0 and below is vulnerable to unauthorized file deletion due to an Inverted CSRF token check in the DeleteFile controller. The code throws an error when the token IS valid and proceeds with file deletion when the token is invalid or missing. This effectively disables CSRF protecti...

PT-2026-42556

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.1 Description An Insecure Direct Object Reference IDOR exists in the 'AddMessage' and 'UpdateMessage' conversation controllers. These controllers accept user-supplied file attachment IDs through the attachmen...

Concrete CMS security vulnerabilities

Concrete CMS is an open-source content management system designed for teams. Concrete CMS versions 9.5.0 and earlier have a security vulnerability. This vulnerability stems from an insecure direct object reference in the attachments parameter of the AddMessage/UpdateMessage functions, which may...

CVE-2026-7890: Server-Side Request Forgery (SSRF)

In Concrete CMS 9.5.0 and below, the RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without validation enabling redirect-to-internal bypasses. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.1 with a...

CVE-2026-8434: Cross-Site Request Forgery (CSRF)

Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery CSRF at concrete/controllers/backend/file rescanMultiple. 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:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N...

Concrete CMS security vulnerabilities

Concrete CMS is an open-source content management system designed for teams. Concrete CMS versions 9.5.0 and earlier have security vulnerabilities, which stem from IDOR. These vulnerabilities may allow unauthorized access to all conversation messages and file attachments...

Concrete CMS security vulnerabilities

Concrete CMS is an open-source content management system designed for teams. Concrete CMS versions 9.5.0 and earlier have a security vulnerability that stems from an authorization bypass in the calendar event front-end dialog box. This vulnerability could lead to cross-calendar data leaks...

CVE-2026-8240: Improper Access Control

Concrete CMS 9.5.0 and below is vulnerable to unauthenticated page metadata disclosure across every page with a configured summary template, revealing the existence of private, draft, and restricted pages while leaking title, path, description, and author information. The Concrete CMS security te...

Concrete CMS security vulnerabilities

Concrete CMS is an open-source content management system designed for teams. Concrete CMS versions 9.5.0 and earlier have a security vulnerability, which stems from a reflective cross-site scripting attack via HTML attribute injection in Legacy Pagination...

PT-2026-42555

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.1 Description An inverted CSRF token check in the DeleteFile controller allows unauthorized file deletion. The system incorrectly throws an error when the token is valid and proceeds with the deletion process...