PT-2026-92390

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

PT-2026-92393

Concrete CMS before 9.5.3 did not enforce a per-page authorization check when reordering pages from the sitemap. In the sitemap Explore dashboard controller, the send to top and send to bottom reorder tasks ran after only a generic sitemap-access check; the controller loaded the page named by the...

CVE-2026-18424: Server-Side Request Forgery (SSRF)

Concrete CMS 9.0.0 to 9.5.2 is vulnerable to Server-Side Request Forgery iremote file import via cross-port reuse of a host's validated DNS pin. When multiple remote URLs share the same host, only the first ValidatedRemoteUrl is retained and reused for every later URL with that host. A...

PT-2026-92122

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-2026-68533: Missing Authorization

Concrete CMS below 9.5.3 conversation attachment uploaded endpoint imported files into the file manager before evaluating the "Add Message Attachments" permission, which was only checked after the file had been stored. A user denied that permission, or an unauthenticated visitor on a guest-postin...

PT-2026-92375

Concrete CMS below 9.5.3 conversation attachment uploaded endpoint imported files into the file manager before evaluating the "Add Message Attachments" permission, which was only checked after the file had been stored. A user denied that permission, or an unauthenticated visitor on a guest-postin...

CVE-2026-81920: Cross-Site Request Forgery (CSRF)

Concrete CMS below 9.5.3 was vulnerable to Cross-Site Request Forgery in the dashboard SEO Excluded Words page. The reset controller action cleared the administrator-configured reserved-word list concrete.seo.excludewords but did not validate the anti-CSRF token that the reset modal emitted, and ...

CVE-2026-18422: Missing Authorization

Concrete CMS before 9.5.3 did not enforce a destination-side authorization check and did not validate a CSRF token in the multilingual page assignment backend action Backend\Page\Multilingual::assign. As a result, an authenticated user who held the Edit Page Multilingual Settings permission on a...

PT-2026-92399

Concrete CMS 9 through 9.5.2 does not perform an authorization check in three actions of the Boards data source dashboard controller update, update data source, and delete data source, which resolve a ConfiguredDataSource directly from an attacker-supplied identifier without confirming the...

CVE-2026-81921: Missing Authorization

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-2026-91772

Flextype CMS through 1.0.0-alpha.3 fails to properly validate id and new id 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 directo...

CVE-2026-81923: Missing Authorization

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...

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...

PT-2026-92413

Concrete CMS before 9.5.3 did not enforce a destination-side authorization check and did not validate a CSRF token in the multilingual page assignment backend action BackendPageMultilingual::assign. As a result, an authenticated user who held the Edit Page Multilingual Settings permission on a...

PT-2026-92402

Concrete CMS 9 before 9.5.3 did not escape SQL LIKE wildcard characters in the keyword search filters used by the file manager, file folders, and page list, allowing an authenticated user with editor-level or higher privileges to submit a crafted search containing many single-character wildcards...

CVE-2026-81926: Improper Neutralization of Input During Web Page Generation

Concrete CMS 9.4.0 through 9.5.2 did not escape colliding page paths before rendering them in the location panel's duplicate-path confirmation dialog. The panel's check endpoint returned the submitted path unmodified in its JSON response, and client-side JavaScript inserted each value into the...

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-2026-18421: Missing Authorization

Concrete CMS 9 through 9.5.2 does not perform an authorization check in three actions of the Boards data source dashboard controller update, updatedatasource, and deletedatasource, which resolve a ConfiguredDataSource directly from an attacker-supplied identifier without confirming the requester'...

CVE-2026-68534: Improper Neutralization of Input During Web Page Generation

Concrete CMS before 9.5.3 rendered Express entry labels as raw HTML when displaying associated entries, resulting in stored cross-site scripting. An unauthenticated attacker could submit a payload through a public Express Form; it then executed in an administrator's dashboard session when the...

PT-2026-92376

Concrete CMS before 9.5.3 rendered Express entry labels as raw HTML when displaying associated entries, resulting in stored cross-site scripting. An unauthenticated attacker could submit a payload through a public Express Form; it then executed in an administrator's dashboard session when the...