CVE-2026-18111: Missing Authentication for Critical Function

Concrete CMS 9 before 9.5.3 was vulnerable to stored cross-site scripting XSS in the Feature, Feature Link, Hero Image, and Image blocks and before Concrete 8.5.21 in the feature and Image blocks because the external link URL was insufficiently validated by the link filter and was rendered withou...

CVE-2026-91751: Improper Limitation of a Pathname to a Restricted Directory

Flextype CMS through 1.0.0-alpha.3 fails to properly validate id and newid parameters in the Entries REST API, allowing API token holders to read, create, or overwrite files outside the entries directory. Attackers can use traversal sequences in API requests to escape the project entries director...

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-2026-81898: Improper Neutralization of Input During Web Page Generation

In Concrete CMS below version 9.5.3, the Address attribute's country-less text formatter skipped HTML-escaping, enabling stored XSS in Express association views. A user able to submit an Address attribute could execute script in the session of any dashboard user who opened the affected entry. The...

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...

PT-2026-92131

In Concrete CMS below CMS 9.5.3, the save control action in the Express entities forms dashboard controller did not validate the anti-CSRF token. By causing an authenticated administrator to submit a forged cross-site request, a remote attacker without credentials could write attacker-controlled...

PT-2026-92165

Name of the Vulnerable Software and Affected Versions Concrete CMS versions 9.0 through 9.5.2 Description The Top Navigation Bar block fails to HTML-escape dropdown child page names before rendering them on the page. This allows a user with permissions to create or rename pages to inject a...

CVE-2026-18425: Missing Authorization

Concrete CMS 9 before 9.5.3 authorized the dashboard sitemap reorder action Concrete\Controller\Backend\Dashboard\SitemapUpdate using only the global accesssitemap task permission and did not check per-page edit permission before updating each page's display order. As a result, an authenticated...

PT-2026-92394

In Concrete CMS before 9.5.3, the SEO Bulk Update Meta Tags editor did not check per-page edit permissions before saving. The saveRecord action validated the per-page CSRF token but never called canEditPageProperties for the target page, so a user who was granted access to the bulk SEO tool and...

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...