CVE-2026-8428: Cross-Site Request Forgery (CSRF)

Concrete CMS 9.5.0 and below emits a CSRF token in the localavailableupdate.php view $token-output'doupdate' but the corresponding doupdate method in concrete/controllers/singlepage/dashboard/system/update/update.php never calls $this-token-validate'doupdate'. The form is rendered as a POST form,...

CVE-2026-8426: Cross-Site Request Forgery (CSRF)

Concrete CMS 9.5.0 and below does not validate a CSRF token before processing requests to /dashboard/extend/update/prepareremoteupgrade/ . An attacker who controls the remote package returned for a known marketplace item ID can overwrite the package PHP on disk and force its upgrade method to...

CVE-2026-8421: Cross-Site Request Forgery (CSRF)

Concrete CMS 9.5.0 and below contains a CSRF vulnerability in the installpackage method of concrete/controllers/singlepage/dashboard/extend/install.php. An attacker who can cause an authenticated administrator to visit a crafted page, and who has placed or caused a package to be present under...

CVE-2026-8417: Cross-Site Request Forgery (CSRF)

Concrete CMS 9.5.0 and below does not validate a CSRF token before processing requests to /dashboard/extend/update/doupdate/ . The doupdate method in concrete/controllers/singlepage/dashboard/extend/update.php checks only canInstallPackages before executing upgradeCoreData and upgrade on the name...

CVE-2026-8350: Incorrect Authorization

Concrete CMS 9.5.0 and below is vulnerable to missing authorization in the bulkuserassignment.php which can lead to privilege escalation to Administrative Group. Any authenticated user with access to the bulk user assignment dashboard page can add any user email to any group and can remove...

CVE-2026-8205: Direct Request

Concrete CMS 9.5.0 and below is vulnerable to authorization bypass in the Calendar Block since actiongetevents does not check canView on the calendar which results in restricted event details being disclosed. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with...

CVE-2026-8204: Authorization Bypass Through User-Controlled Key

Concrete CMS 9.5.0 and below is vulnerable to authorization Bypass in the Calendar Event Frontend Dialog which can allow cross-calendar data disclosure. A public calendar block can be used as a pivot point to access private calendar data. The Concrete CMS security team gave this vulnerability a...

CVE-2026-8203: Improper Neutralization of Input During Web Page Generation

Concrete CMS 9.5.0 and below has Stored XSS on the height parameter. The controller does not validate or sanitize $height. Any user with editor privileges can inject malicious JavaScript that executes in the context of any visitor's browser, potentially leading to session hijacking, credential...

CVE-2026-8197: Improper Neutralization of Input During Web Page Generation

Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via OAuth integration name. The OAuth authorize template renders the integration name admin-controlled through Concrete's t translation helper as a sprintf-style format. The ... wrap is built by PHP string interpolation before t runs, so th...

CVE-2026-8140: Cross-Site Request Forgery (CSRF)

Concrete CMS 9.5.0 and below does not validate a CSRF token before processing requests to /dashboard/extend/install/download/ . The download method in concrete/controllers/singlepage/dashboard/extend/install.php checks only the canInstallPackages permission before fetching a remote marketplace...

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-2026-8134: 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...

CVE-2026-8239: Missing Authorization

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/getrating' endpoint confirms existence and returns rating score for any message by ID. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with...

CVE-2026-8337: Authorization Bypass Through User-Controlled Key

Concrete CMS 9.5.0 and below is vulnerable to IDOR in surveys. To be vulnerable, a site would have to be configured in such a way that both public and private surveys are present on the site. An unauthenticated attacker can vote in the restricted survey by submitting the restricted optionID throu...

CVE-2026-8245: Improper Neutralization of Script in Attributes in a Web Page

Concrete CMS 9.5.0 and below is vulnerable to Reflected XSS in Legacy Pagination via HTML attribute injection. Concrete\Core\Legacy\Pagination builds pagination links by raw-interpolating its $URL field into href="" . Any authenticated admin or report viewer with access to...

PT-2026-42560

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.1 Description An Insecure Direct Object Reference IDOR exists where the '/ccm/frontend/conversations/message page' endpoint returns the full content of any conversation message. This allows an unauthenticated...

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 could allow unauthorized attackers to submit restricted survey options through public survey endpoints...

Concrete CMS Cross-Site Request Forgery Vulnerability

Concrete CMS is an open-source content management system developed by Concrete CMS. Versions of Concrete CMS from 9 to 9.5.0 had a cross-site request forgeing vulnerability, which originated from the concrete/controllers/dialog/logs/delete file...

PT-2026-42571

Name of the Vulnerable Software and Affected Versions Concrete CMS versions 9.0.0 through 9.4.x Description Cross Site Request Forgery CSRF occurs at the 'concrete/controllers/dialog/express/association/reorder' endpoint. CSRF is a type of attack that tricks a victim into submitting a malicious...

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...