GHSA-QVJF-922G-PJ44 Kirby CMS vulnerable to cross-site scripting (XSS) from links in KirbyTags and image blocks in the site frontend

TL;DR This vulnerability affects all Kirby sites that allow the use of the link: … KirbyTag, the link: parameter of the image: … KirbyTag, the built-in image block with a link or the HTML importer for blocks, when content is authored by users who may not be fully trusted. The attack requires an...

Missing Authorization

Overview Affected versions of this package are vulnerable to Missing Authorization via the content-locking process. An attacker can obtain email addresses and identifiers of users who should be inaccessible by sending requests as an authenticated user with restricted users.access or users.list...

GHSA-9HX7-C53C-V6X8 Kirby CMS has pre-authentication path traversal and PHP file inclusion during user lookup

TL;DR This vulnerability affects all Kirby sites on Kirby 5.3.0-5.4.0 and is independent from setup conditions and authentication. This vulnerability is of high severity for all Kirby sites. ---- Introduction Path traversal is a type of attack that allows to access arbitrary filesystem paths. By...

Kirby CMS has pre-authentication path traversal and PHP file inclusion during user lookup

TL;DR This vulnerability affects all Kirby sites on Kirby 5.3.0-5.4.0 and is independent from setup conditions and authentication. This vulnerability is of high severity for all Kirby sites. ---- Introduction Path traversal is a type of attack that allows to access arbitrary filesystem paths. By...

PHP Remote File Inclusion

Overview Affected versions of this package are vulnerable to PHP Remote File Inclusion via the Users collection lookup process. An attacker can include arbitrary PHP files and probe for the existence of directories by supplying crafted user IDs containing path traversal sequences. Remediation...

GHSA-2XW4-V2WX-HQQ9 Kirby CMS's `pages.access` permission is not checked during rendering of page drafts

TL;DR This vulnerability affects all Kirby sites where users of a particular role have no permission to access pages pages.access permission is disabled. This can be due to configuration in the user blueprints, via options in the model blueprints or via a combination of both settings. Kirby sites...

Kirby CMS's `pages.access` permission is not checked during rendering of page drafts

TL;DR This vulnerability affects all Kirby sites where users of a particular role have no permission to access pages pages.access permission is disabled. This can be due to configuration in the user blueprints, via options in the model blueprints or via a combination of both settings. Kirby sites...

Missing Authorization

Overview Affected versions of this package are vulnerable to Missing Authorization in the pages.access permission check during the rendering process of page drafts. An attacker can gain unauthorized access to sensitive page draft content by authenticating as a user without the required permission...

GHSA-5FHX-9Q32-Q257 Kirby CMS vulnerable to cross-site scripting (XSS) from list field content in the site frontend

TL;DR This vulnerability affects all Kirby sites that use the list field or list block, when content is authored by users who may not be fully trusted. The attack requires an authenticated Panel user with update permission to any list field or list block. This vulnerability is of high severity fo...

Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

Overview Affected versions of this package are vulnerable to Use of Externally-Controlled Input to Select Classes or Code 'Unsafe Reflection' via the REST API search and collection query endpoints. An attacker can execute arbitrary methods on model objects by supplying crafted queries, potentiall...

Kirby CMS has an Arbitrary Method Call via REST API Search and Collection Query Endpoints

TL;DR This vulnerability affects all Kirby sites that might have potential attackers in the group of authenticated Panel users. This vulnerability is of high severity for affected sites and has a high real-world impact. ---- Introduction Arbitrary method call is a type of arbitrary code execution...

GHSA-86RH-H242-J8XP Kirby CMS has an Arbitrary Method Call via REST API Search and Collection Query Endpoints

TL;DR This vulnerability affects all Kirby sites that might have potential attackers in the group of authenticated Panel users. This vulnerability is of high severity for affected sites and has a high real-world impact. ---- Introduction Arbitrary method call is a type of arbitrary code execution...

PT-2026-43451

TL;DR This vulnerability affects all Kirby sites where users of a particular role have no permission to access pages pages.access permission is disabled. This can be due to configuration in the user blueprints, via options in the model blueprints or via a combination of both settings. Kirby sites...

CVE-2026-42137

Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, pages.access/list and files.access/list permissions are not consistently checked in the Panel and REST API. This issue has been patched in versions 4.9.0 and 5.4.0...

CVE-2026-42051

Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, the system API endpoint leaks license data and installed version to authenticated users. This issue has been patched in versions 4.9.0 and 5.4.0...

CVE-2026-42174

Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, user avatar creation, replacement and deletion are not gated by user update permissions. This issue has been patched in versions 4.9.0 and 5.4.0...

CVE-2026-42069

Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, read access to site, user and role information is not gated by permissions. This issue has been patched in versions 4.9.0 and 5.4.0...

CVE-2026-42051

Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, the system API endpoint leaks license data and installed version to authenticated users. This issue has been patched in versions 4.9.0 and 5.4.0...

CVE-2026-42174

Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, user avatar creation, replacement and deletion are not gated by user update permissions. This issue has been patched in versions 4.9.0 and 5.4.0...

EUVD-2026-28889

Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, pages.access/list and files.access/list permissions are not consistently checked in the Panel and REST API. This issue has been patched in versions 4.9.0 and 5.4.0...