EUVD-2026-78161

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-2026-18426: Missing Authorization

Concrete CMS 9.0.0 through 9.5.2 did not enforce a block-level edit-permission check on the Express Form block's control-management actions, which relied solely on CSRF token validation. Because the token is bound to the user and action rather than to a specific block, page, or form, an...

PT-2026-92189

Concrete CMS 9.0.0 to 9.5.2 stored group folder names without sanitization and printed them unescaped on the Members Groups dashboard page, resulting in stored cross-site scripting. The add and edit group-folder handlers stored the submitted folder name without neutralizing HTML, and the group...

PT-2026-92515

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.3 Description Improper neutralization of a user-supplied custom date format when rendering conversation messages leads to reflected cross-site scripting XSS, a technique where malicious scripts are injected...

PT-2026-92374

Name of the Vulnerable Software and Affected Versions Concrete CMS versions 9.0.0 through 9.0.0 Description The dashboard group type controller fails to validate a CSRF Cross-Site Request Forgery token during its delete action. This allows a remote unauthenticated attacker to trick an authenticat...

PT-2026-92180

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.3 Description Stored Cross-Site Scripting XSS is possible in Express association views due to the Address attribute's country-less text formatter skipping HTML-escaping. This occurs when a non-required Addres...

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-2026-81922: Missing Authorization

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 sendtotop and sendtobottom reorder tasks ran after only a generic sitemap-access check; the controller loaded the page named by the...

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-2026-92123

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...

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...

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...