EUVD-2026-31347

Concrete CMS 9.5.0 and below is vulnerable to IDOR combined with a missing authentication gate. The endpoint /ccm/system/dialogs/file/usage/fID accepts an integer file ID in the URL and returns internal site structure data page IDs, versions, URL paths to anyone who sends a GET request. The...

GHSA-58C8-VVQW-CM7M Concrete CMS is vulnerable to IDOR combined with a missing authentication gate

Concrete CMS 9.5.0 and below is vulnerable to IDOR combined with a missing authentication gate. The endpoint /ccm/system/dialogs/file/usage/fID accepts an integer file ID in the URL and returns internal site structure data page IDs, versions, URL paths to anyone who sends a GET request...

Concrete CMS is vulnerable to IDOR in AddMessage/UpdateMessage

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,...

Concrete CMS is vulnerable to Stored XSS via external-link page cvName

Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via external-link page cvName because updateCollectionAliasExternal bypasses being sanitized...

Concrete CMS has a session-hardening bypass and allows password change without reauthorization

Concrete CMS 9.5.0 and below is vulnerable to password change without reauthorization and session-hardening bypass. The user-profile edit controller passes the entire raw POST array to UserInfo::update without field whitelisting resulting in password change without requiring the current password ...

Concrete CMS has an unauthorized file access issue

In Concrete CMS 9.5.0 and below, the submitpassword method in concrete/controllers/singlepage/downloadfile.php allows unauthorized file access since downloading permission-restricted files bypasses the viewfile permission check. Files without passwords can be downloaded and any user who knows a...

EUVD-2026-31379

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...

Concrete CMS: OAuth 2.0 Authorization-Code Handler Bypasses Account Status

For Concrete CMS 9.5.0 and below, OAuth 2.0 Authorization-Code Handler Bypasses Account Status. A user with uIsActive=0 suspended, banned, terminated employee can still authenticate via OAuth and receive valid API tokens...

EUVD-2026-31354

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/messagepage' endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and th...

GHSA-FQG3-8W8R-8G94 Concrete CMS has an unauthorized file access issue

In Concrete CMS 9.5.0 and below, the submitpassword method in concrete/controllers/singlepage/downloadfile.php allows unauthorized file access since downloading permission-restricted files bypasses the viewfile permission check. Files without passwords can be downloaded and any user who knows a...

CVE-2026-8340: Cross-Site Request Forgery (CSRF)

Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\File::approveVersion. Victim with editfilecontents permission is CSRF'd into publishing an attacker-chosen previously-uploaded version downgrade to an older version of a file, or activation of a co-editor's unpublished version. The...

PT-2026-42773

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.1 Description An Insecure Direct Object Reference IDOR and incorrect authorization level exist in the Express association Reorder dialog. This allows for cross-entity state tampering, where a user with...

Concrete CMS security vulnerabilities

Concrete CMS is an open-source content management system developed by Concrete CMS. Versions of Concrete CMS 9.5.0 and earlier contain security vulnerabilities. These vulnerabilities stem from insecure direct object references in the Express-associated reorder dialog boxes, as well as incorrect...

CVE-2026-8347: Authorization Bypass Through User-Controlled Key

Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-authorization-level in the Express association Reorder dialog. This can cause Cross-entity state tampering with view-only permission on one entry. To be affected, a website has to be using express and relying on express entity...

CVE-2026-8353: Improper Neutralization of Input During Web Page Generation

Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XSS via page name in the Atomik theme. A rogue editor can inject arbitrary JavaScript that executes in the context of any authenticated user visiting the affected account pages. This can lead to session hijacking, credential theft, malicio...

PT-2026-42774

Name of the Vulnerable Software and Affected Versions Concrete CMS versions 9.0 through 9.5.0 Description Stored Cross-Site Scripting XSS exists in the Atomik theme. A user with editor privileges can inject arbitrary JavaScript through the page name, which then executes in the context of any...

Concrete CMS security vulnerabilities

Concrete CMS is an open-source content management system developed by Concrete CMS. Versions 9.0 to 9.5.0 of Concrete CMS have security vulnerabilities. These vulnerabilities stem from stored cross-site scripting in page names within the Atomik theme. This could allow malicious editors to inject...

CVE-2026-41147: Improper Neutralization of Input During Web Page Generation

NukeViet CMS is a multi Content Management System. Versions 4.5.07 and prior contain a Stored Cross-Site Scripting XSS vulnerability caused by insufficient server-side input sanitization in the Request class. The application relies primarily on client-side filtering to sanitize HTML tags and...

CVE-2026-8415

Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery CSRF at concrete/controllers/dialog/express/association/reorder. 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-2026-8416

Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery CSRF at concrete/controllers/backend/file addFavoriteFolder$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...