Winston Crooker

Concrete CMS 9.5.0 and below is vulnerable to CSRF via BackendFile::approveVersion. Victim with edit file contents 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an attacker-chosen previously-uploaded version (downgrade to an older version of a file, or activation of a co-editor's unpublished version).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 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. Thanks Winston Crooker for reporting.

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 ordering. 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:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.

**Name of the Vulnerable Software and Affected Versions** Concrete CMS versions prior to 9.5.1 **Description** An authorization bypass exists in the Calendar Event Frontend Dialog. This flaw allows for cross-calendar data disclosure, where a public calendar block can be utilized as a pivot point to gain unauthorized access to private calendar data. **Recommendations** Update to a version newer than 9.5.0.

**Name of the Vulnerable Software and Affected Versions** Concrete CMS versions 9.5.0 and earlier **Description** An Insecure Direct Object Reference (IDOR), which occurs when an application provides direct access to objects based on user-supplied input, combined with a missing authentication gate allows unauthorized users to retrieve internal site structure data. By sending a GET request to the endpoint '/ccm/system/dialogs/file/usage/{fID}', an attacker can use the `fID` variable to obtain page IDs, versions, and URL paths. **Recommendations** Update to a version later than 9.5.0. As a temporary workaround, restrict access to the '/ccm/system/dialogs/file/usage/{fID}' endpoint to minimize the risk of exploitation.

**Name of the Vulnerable Software and Affected Versions** Concrete CMS versions prior to 9.5.1 **Description** Unauthenticated users can access page metadata on any page that has a configured summary template. This allows for the disclosure of private, draft, and restricted pages, leaking information such as the title, path, description, and author. **Recommendations** Update to a version newer than 9.5.0.