Know every vulnerabilitybefore it knows you.
DevGuard continuously monitors your dependencies and alerts you when CVEs like this one affect your stack — with real-time threat intelligence built for developers.
GHSA-23q2-54qv-rq5x
No affected components available
TL;DR
This vulnerability affects all Kirby sites that use the pages field and 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 blueprint(s), options in the model blueprint(s), or a combination of both settings.
It was possible to confirm the existence of arbitrary pages and to retrieve the value of the title field of the pages found.
The vulnerability can only be exploited by authenticated users. Write actions are not affected by this vulnerability.
Introduction
Missing authorization allows authenticated users to perform actions they are not intended to have access to.
The effects of missing authorization can include unauthorized access to sensitive information as well as unauthorized changes to content or system information.
Affected components
Kirby's user permissions control which user role is allowed to perform specific actions on content models in the CMS. These permissions are defined for each role in the user blueprint (site/blueprints/users/...). It is also possible to customize the permissions for each target model in the model blueprints (such as in site/blueprints/pages/...) using the options feature. The permissions and options together control the authorization of user actions.
Kirby provides the pages.access and pages.list permissions (among others). The list permission controls whether affected models appear in lists throughout the Panel and REST API. The access permission has the same effect but also disables direct access to the affected models.
This vulnerability affects the backend logic for the page picker that is used in the pages field to select pages. The picker is opened based on a user-provided parent page or the site model.
Impact
In affected releases, the backend logic did not validate that the user-provided parent page or site was accessible to the current user. This allowed authenticated attackers with knowledge of the full path to an existing page to confirm the existence of a particular page and to retrieve the value of the title field of that page. This could lead to the disclosure of sensitive information.
Patches
The problem has been patched in Kirby 4.9.4 and Kirby 5.4.4. Please update to one of these or a later version to fix the vulnerability.
In all of the mentioned releases, we have added a check verifying that the requested parent page or site is accessible to the current user before returning the picker data.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
Browse More
Continuously monitor your dependencies and get alerted when vulnerabilities like this one affect your stack.
Checkout DevGuard