PT-2026-93112

Name of the Vulnerable Software and Affected Versions Concrete CMS versions 9.0.0 through 9.5.2 Description An issue exists where block-level edit-permission checks are not enforced on the Express Form block's control-management actions. The system relies exclusively on CSRF Cross-Site Request...

PT-2026-92121

Name of the Vulnerable Software and Affected Versions Concrete CMS versions 9.0.0 through 9.5.2 Description An authorization check is missing on the user selector autocomplete endpoint '/ccm/system/user/autocomplete', which supports the Preview as User panel and other user-selector components. Th...

CVE-2026-18110: Missing Authorization

Concrete CMS 9 9.0.0 through 9.5.2 does not perform an authorization check on the user selector autocomplete endpoint /ccm/system/user/autocomplete, which backs the "Preview as User" panel and other user-selector components. The endpoint validates only a CSRF-style access token that is bound to t...

CVE-2026-81919: Cross-Site Request Forgery (CSRF)

Concrete CMS below 9.5.3 did not validate an anti-CSRF token on the block-arrangement backend endpoint the arrange action of Concrete\Controller\Backend\Page\ArrangeBlocks. The action enforced page-edit authorization but performed no token check, and its route accepted any HTTP method, so an...

PT-2026-92123

Payload Plugins is a collection of plugins designed to enhance Payload CMS. From 0.3.0 until 0.4.0, @jhb.software/payload-cloudinary-plugin deployments with clientUploads enabled expose POST /api/cloudinary-generate-signature, whose handler in cloudinary/src/getGenerateSignature.ts passes...

CVE-2026-18113: Improper Neutralization of Input During Web Page Generation

In Concrete CMS 9.0 to 9.5.2, the Top Navigation Bar block did not HTML-escape dropdown child page names before writing them into the page, so a user who could create or rename pages could store a script through a child page name and have it run in the browser of any visitor, editor, or...

CVE-2026-81894: Improper Neutralization of Special Elements used in an SQL Command

Concrete CMS 9.5.2 and below is vulnerable to stored DOM-based Cross-site Scripting XSS via the Gallery block's per-image Caption field because the bundled Magnific Popup lightbox script concrete/js/features/imagery/frontend.js re-parses the attribute-decoded caption as HTML through jQuery's...

PT-2026-92128

Concrete CMS 9.5.2 and below is vulnerable to stored DOM-based Cross-site Scripting XSS via the Gallery block's per-image Caption field because the bundled Magnific Popup lightbox script concrete/js/features/imagery/frontend.js re-parses the attribute-decoded caption as HTML through jQuery's...

PT-2026-92392

Concrete CMS 8.5.3 through 9.5.2 enabled the OAuth 2.0 refresh-token grant using the unmodified upstream League grant, which issued new access tokens from a valid refresh token without re-checking the associated account's active status. A user who obtained a refresh token while active could...

CVE-2026-81900

Concrete CMS before 9.5.3 applied only trim to the YouTube block's stored width and height values and printed them into iframe HTML attributes without escaping or integer casting, resulting in stored cross-site scripting. A user with editblock permission could inject an event handler that execute...

CVE-2026-18116

Concrete CMS 8.3.0 to 9.5.2 stored calendar event names without sanitization and rendered them without HTML escaping in the workflow approval and deletion notifications shown in the dashboard "Waiting For Me" block. A registered user permitted to add events to a calendar governed by an approval...

CVE-2026-18117

Concrete CMS 9.0.0 through 9.5.3 is vulnerable to stored XSS via the custom page alias name customAliasName because the Edit Alias dialog applied only trim to the submitted value and performed no input neutralization. An authenticated user holding canWrite editor permission on a page could store ...

CVE-2026-81900

Concrete CMS before 9.5.3 is affected by a stored cross-site scripting vulnerability in the YouTube block (vWidth/vHeight). The root cause is that only trim() was applied to the stored width and height values before printing them into iframe HTML attributes , without escaping or integer casting. ...

CVE-2026-81900 Concrete CMS before 9.5.3 is vulnerable to Stored XSS in the YouTube block (vWidth/vHeight)

Concrete CMS before 9.5.3 applied only trim to the YouTube block's stored width and height values and printed them into iframe HTML attributes without escaping or integer casting, resulting in stored cross-site scripting. A user with editblock permission could inject an event handler that execute...

CVE-2026-81900 Concrete CMS before 9.5.3 is vulnerable to Stored XSS in the YouTube block (vWidth/vHeight)

Concrete CMS before 9.5.3 applied only trim to the YouTube block's stored width and height values and printed them into iframe HTML attributes without escaping or integer casting, resulting in stored cross-site scripting. A user with editblock permission could inject an event handler that execute...

CVE-2026-81900 Concrete CMS before 9.5.3 is vulnerable to Stored XSS in the YouTube block (vWidth/vHeight)

Concrete CMS before 9.5.3 applied only trim to the YouTube block's stored width and height values and printed them into iframe HTML attributes without escaping or integer casting, resulting in stored cross-site scripting. A user with editblock permission could inject an event handler that execute...

CVE-2026-18116 Concrete CMS 8.3.0 to 9.5.2 is vulnerable to Stored XSS in Calendar Event Name via Workflow Approval Notifications

Concrete CMS 8.3.0 to 9.5.2 stored calendar event names without sanitization and rendered them without HTML escaping in the workflow approval and deletion notifications shown in the dashboard "Waiting For Me" block. A registered user permitted to add events to a calendar governed by an approval...

CVE-2026-18116 Concrete CMS 8.3.0 to 9.5.2 is vulnerable to Stored XSS in Calendar Event Name via Workflow Approval Notifications

Concrete CMS 8.3.0 to 9.5.2 stored calendar event names without sanitization and rendered them without HTML escaping in the workflow approval and deletion notifications shown in the dashboard "Waiting For Me" block. A registered user permitted to add events to a calendar governed by an approval...

CVE-2026-18116

Concrete CMS versions 8.3.0 through 9.5.2 are affected by a Stored XSS in calendar event names. Event names were stored without sanitization and rendered without HTML escaping in the workflow approval/deletion notifications within the dashboard "Waiting For Me" block. A registered user with permi...

CVE-2026-18116 Concrete CMS 8.3.0 to 9.5.2 is vulnerable to Stored XSS in Calendar Event Name via Workflow Approval Notifications

Concrete CMS 8.3.0 to 9.5.2 stored calendar event names without sanitization and rendered them without HTML escaping in the workflow approval and deletion notifications shown in the dashboard "Waiting For Me" block. A registered user permitted to add events to a calendar governed by an approval...