PT-2026-90499

Concrete CMS below 9.5.3 is vulnerable to Stored XSS via the Date Format field in the Page Attribute Display block. A user with edit page contents permissions could store a payload which executes in the browser of any visitor who viewed a page where the block was configured to display a date-type...

PT-2026-90048

Concrete CMS 9 through 9.5.2 is vulnerable to Server-Side Template Injection SSTI in Theme Customizer via Unvalidated Style Values. Values submitted through the customizer color channels and other style properties handled by ColorStyle and sibling Style classes such as FontFamilyStyle and...

CVE-2026-81915: Missing Authorization

Concrete CMS below 9.5.3 does not perform an object-level authorization check when a Page Type was updated. The Types::submit dashboard controller loaded and saved the Page Type identified by a user-supplied ptID without calling canEditPageType, so a signed-in dashboard user permitted to edit one...

PT-2026-90494

Name of the Vulnerable Software and Affected Versions Concrete CMS versions 9.2.0 through 9.5.2 Description The Area API's 'block-create' endpoint fails to invoke the validate method of the block type controller for submitted data. For blocks that reference files, such as hero image and gallery,...

PT-2026-89679

Flextype CMS versions 0.9.9 through 1.0.0-alpha.3 fail to HTML-escape plugin directory names in the dependency error page rendered by getValidPluginsDependencies. Attackers with write access to the plugins directory can create a plugin with HTML characters in its name to execute arbitrary scripts...

CVE-2026-18121: Missing Authorization

Concrete CMS 9.5.2 and below is vulnerable to an authorization bypass IDOR because the frontend calendar lightbox endpoint /ccm/calendar/viewevent/bID/occurrenceid does not verify that the caller is permitted to view the calendar that owns the requested event occurrence. The controller loads the...

PT-2026-89810

a-blog cms Ver. 3.2.33 and earlier contains a path traversal vulnerability, which allows an unauthenticated attacker to read or delete arbitrary files on the affected product...

PT-2026-90001

Concrete CMS 9.2.0 to 9.5.2 contain a missing authorization vulnerability in the REST API Groups list endpoint. The listGroups method in concrete/src/Api/Controller/Groups.php registers a permissions checker callback that unconditionally returns true, so no per-object tree node authorization is...

PT-2026-89996

Concrete CMS 9.2.0 to 9.5.2 Express REST API list endpoint exposes restricted Express entries via Missing Authorization; the Concrete CMS REST API's Express entry collection endpoint disabled the per-entry view permission check. An OAuth token with read scope for an Express entity could enumerate...

PT-2026-90151

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.3 Description An object-level authorization failure occurs when updating a Page Type. The Types::submit dashboard controller processes the ptID variable provided by the user to load and save a Page Type witho...

CVE-2026-68528: Improper Neutralization of Input During Web Page Generation

Concrete CMS RSS Displayer block below version 9.5.3 rendered remote feed item titles without HTML escaping, resulting in stored cross-site scripting. An attacker able to control a title in a syndicated feed could execute script in the site origin for any visitor to the affected page, including...

PT-2026-90002

Concrete CMS 9 through 9.5.2 is vulnerable to Missing Authorization in the block alias route Process::alias in concrete/controllers/backend/block/process.php.It does not verify that the referenced block is genuinely orphaned on the target page, nor that the caller holds any permission over the...

CVE-2026-81909: Missing Authorization

Concrete CMS 9 through 9.5.2 is vulnerable to Missing Authorization in the block alias route Process::alias in concrete/controllers/backend/block/process.php.It does not verify that the referenced block is genuinely orphaned on the target page, nor that the caller holds any permission over the...

CVE-2026-18122: Missing Authorization

Concrete CMS 9.2.0 to 9.5.2 Express REST API list endpoint exposes restricted Express entries via Missing Authorization; the Concrete CMS REST API's Express entry collection endpoint disabled the per-entry view permission check. An OAuth token with read scope for an Express entity could enumerate...

PT-2026-89999

Concrete CMS RSS Displayer block below version 9.5.3 rendered remote feed item titles without HTML escaping, resulting in stored cross-site scripting. An attacker able to control a title in a syndicated feed could execute script in the site origin for any visitor to the affected page, including...

CVE-2026-89145: Improper Neutralization of Input During Web Page Generation

Flextype CMS versions 0.9.9 through 1.0.0-alpha.3 fail to HTML-escape plugin directory names in the dependency error page rendered by getValidPluginsDependencies. Attackers with write access to the plugins directory can create a plugin with HTML characters in its name to execute arbitrary scripts...

CVE-2026-81905: Incorrect Authorization

Concrete CMS below 9.5.3 stores user validation hashes for multiple purposes email/registration validation, password reset, and persistent login in a single table with a type column, but the redemption path resolves a hash by value alone and does not verify its type. As a result, a hash issued fo...

CVE-2026-81910: Improper Neutralization of Special Elements Used in a Template Engine

Concrete CMS 9 through 9.5.2 is vulnerable to Server-Side Template Injection SSTI in Theme Customizer via Unvalidated Style Values. Values submitted through the customizer color channels and other style properties handled by ColorStyle and sibling Style classes such as FontFamilyStyle and...

CVE-2026-87727: Improper Limitation of a Pathname to a Restricted Directory

a-blog cms Ver. 3.2.33 and earlier contains a path traversal vulnerability, which allows an unauthenticated attacker to read or delete arbitrary files on the affected product...

CVE-2026-81918: Improper Neutralization of Input During Web Page Generation

Concrete CMS below 9.5.3 is vulnerable to Stored XSS via the Date Format field in the Page Attribute Display block. A user with editpagecontents permissions could store a payload which executes in the browser of any visitor who viewed a page where the block was configured to display a date-type...