Winter: CSRF through AJAX handler names reachable as backend page actions

Impact Affected versions of Winter CMS allow a backend AJAX handler to be invoked by a plain top-level GET navigation with no CSRF token. Backend\Classes\Controller::actionExists accepted any public method on a controller as a page action, so handler-shaped names were never reserved from URL...

GHSA-5CWR-5JXG-PCF6 Winter: Stored XSS through cached Brand Settings and Editor Settings custom styles

Impact Users with the backend.managebranding "Customize the back-end" or backend.manageeditor "Manage global code editor preferences" permission can provide custom CSS through Settings → Customize Backend → Styles or Settings → Editor Settings → Markup Styles that is compiled through the LESS CSS...

Winter: Stored XSS through cached Brand Settings and Editor Settings custom styles

Impact Users with the backend.managebranding "Customize the back-end" or backend.manageeditor "Manage global code editor preferences" permission can provide custom CSS through Settings → Customize Backend → Styles or Settings → Editor Settings → Markup Styles that is compiled through the LESS CSS...

GHSA-FM29-4MQ3-PHG6 Winter: ImportExportController AJAX handlers bypass granular import/export permission gate

Impact Affected versions of Winter CMS did not enforce the ImportExportController behavior's granular access control on the handlers that actually perform the work. The behavior supports per-operation access control through the importpermissions and exportpermissions configuration keys, enforced ...

Winter: ImportExportController AJAX handlers bypass granular import/export permission gate

Impact Affected versions of Winter CMS did not enforce the ImportExportController behavior's granular access control on the handlers that actually perform the work. The behavior supports per-operation access control through the importpermissions and exportpermissions configuration keys, enforced ...

GHSA-MPMW-F6H6-3G26 Winter: My Account preview exposes another backend user's profile by record ID

Impact Backend\Controllers\MyAccount, introduced in v1.2.13, declares an empty $requiredPermissions array so that any authenticated backend user can manage their own account. It implements the FormController behavior, which exposes three routable actions — create, update and preview — that each...

Winter: My Account preview exposes another backend user's profile by record ID

Impact Backend\Controllers\MyAccount, introduced in v1.2.13, declares an empty $requiredPermissions array so that any authenticated backend user can manage their own account. It implements the FormController behavior, which exposes three routable actions — create, update and preview — that each...

Winter: Stored XSS through Backend List widget image columns

Impact Backend\Widgets\Lists::evalImageTypeValue interpolated the resolved image URL into a single-quoted src attribute without escaping it. Where a list column of type image rendered an attacker-influenced value, that value could break out of the attribute and inject arbitrary attributes —...

GHSA-8CFW-PCWH-V63W Winter: Authenticated Twig sandbox escape in CMS SecurityPolicy (bypass of CVE-2024-54149)

Impact Affected versions of Winter CMS allow authenticated backend users with CMS template-editing permissions to escape the Twig sandbox "safe mode" that is meant to restrict what template code can do. Using any of the following permissions, an attacker can read and modify arbitrary database...

Winter: Authenticated Twig sandbox escape in CMS SecurityPolicy (bypass of CVE-2024-54149)

Impact Affected versions of Winter CMS allow authenticated backend users with CMS template-editing permissions to escape the Twig sandbox "safe mode" that is meant to restrict what template code can do. Using any of the following permissions, an attacker can read and modify arbitrary database...

GHSA-2223-F22X-24CQ Winter: Local File Inclusion through =include directives in JavaScript asset compilation

Impact Affected versions of Winter CMS allow authenticated backend users with the cms.manageassets permission "Manage website assets - images, JavaScript files, CSS files" to disclose arbitrary files readable by the PHP process by placing an =include / =require directive in a theme JavaScript...

Winter: Local File Inclusion through =include directives in JavaScript asset compilation

Impact Affected versions of Winter CMS allow authenticated backend users with the cms.manageassets permission "Manage website assets - images, JavaScript files, CSS files" to disclose arbitrary files readable by the PHP process by placing an =include / =require directive in a theme JavaScript...

GHSA-58FP-MCX6-7QF9 Winter: Local File Inclusion through @import directives in LESS compilation of backend customizable stylesheets and theme assets

Impact Affected versions of Winter CMS allow authenticated backend users with the following permissions to disclose arbitrary files readable by the PHP process by injecting @import inline "" directives into LESS source that the backend compiles. Four entry points share the same root cause: - Bran...

Winter: Local File Inclusion through @import directives in LESS compilation of backend customizable stylesheets and theme assets

Impact Affected versions of Winter CMS allow authenticated backend users with the following permissions to disclose arbitrary files readable by the PHP process by injecting @import inline "" directives into LESS source that the backend compiles. Four entry points share the same root cause: - Bran...

GHSA-3277-H8G9-QJ5F Winter: Authenticated IDOR in backend FileUpload widget allows cross-user access to attachment metadata

Impact The backend FileUpload form widget trusted an attacker-controlled fileid POST parameter when resolving the attachment it operates on. The lookup FileUpload::getFileRecord resolved the posted id against the global systemfiles table without verifying that the file belonged to the widget's ow...

Winter: Authenticated IDOR in backend FileUpload widget allows cross-user access to attachment metadata

Impact The backend FileUpload form widget trusted an attacker-controlled fileid POST parameter when resolving the attachment it operates on. The lookup FileUpload::getFileRecord resolved the posted id against the global systemfiles table without verifying that the file belonged to the widget's ow...

PT-2026-80786

Impact Affected versions of Winter CMS allow authenticated backend users with the following permissions to disclose arbitrary files readable by the PHP process by injecting @import inline "" directives into LESS source that the backend compiles. Four entry points share the same root cause: - Bran...

GHSA-J5JQ-CR68-V2XX Winter: Authenticated backend users can bypass Users controller permission checks

Impact Affected versions of Winter CMS did not validate the handler name submitted through the form postback mechanism handler POST field in the same way as AJAX requests XWINTERREQUESTHANDLER header. The AJAX path validates that handler names match the onA-Z\w+ pattern, but the postback path...

Winter: Authenticated backend users can bypass Users controller permission checks

Impact Affected versions of Winter CMS did not validate the handler name submitted through the form postback mechanism handler POST field in the same way as AJAX requests XWINTERREQUESTHANDLER header. The AJAX path validates that handler names match the onA-Z\w+ pattern, but the postback path...

Winter: Broken access control in `Cms\Controllers\Index` allows cross-template actions and unauthorized asset uploads

Impact Affected versions of Winter CMS did not enforce per-template-type permission checks in the CMS section's AJAX handlers. The CMS controller Cms\Controllers\Index used OR-logic across its five permissions cms.managepages, cms.managepartials, cms.managelayouts, cms.managecontent,...