getkirby Kirby up to 5.4.0 Users Collection index.php find ID path traversal

Summaryinfo

A vulnerability identified as problematic has been detected in getkirby Kirby up to 5.4.0. The impacted element is the function find of the file index.php of the component Users Collection. The manipulation of the argument ID leads to path traversal. This vulnerability is documented as CVE-2026-44177. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in getkirby Kirby up to 5.4.0 and classified as problematic. This issue affects the function find of the file index.php of the component Users Collection. The manipulation of the argument ID with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. The summary by CVE is:

Kirby is an open-source content management system. In versions 5.3.0 and above but prior to 5.4.1, Kirby did not correctly validate the provided user ID, resulting in a path traversal vulnerability. Version 5.3.0 introduced a performance improvement to the Users collection that loaded user objects lazily when first needed. Users were queried by their ID, which was then used to locate the corresponding account directory under site/accounts. This affected the authentication API (accessible to unauthenticated requests), the users API (accessible only to authenticated users), and any other place that uses $users->find() to look up an individual user by a request-provided email or ID. As a result, an attacker could trigger arbitrary PHP file inclusion of files named  index.php (for example, the main PHP files of plugins), the impact of which depends on the logic those files contain. It also allowed probing for the existence of arbitrary directories on the server, letting attackers fingerprint the server and site setup, including installed plugins and the content structure. This issue has been fixed in version 5.4.1.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-44177 since 05/05/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

By approaching the search of inurl:index.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 5.4.1 eliminates this vulnerability.

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Productinfo

Vendor

• getkirby

Name

• Kirby

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4.0

Website

• Product: https://github.com/getkirby/kirby/

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