Kirby is a content management system. The new link field introduced in Kirby 4 allows several different link types that each validate the entered link to the relevant URL format. It also includes a "Custom" link type for advanced use cases that don't fit any of the pre-defined link formats.  As the "Custom" link type is meant to be flexible, it also allows the javascript: URL scheme. In some use cases this can be intended, but it can also be misused by attackers to execute arbitrary JavaScript code when a user or visitor clicks on a link that is generated from the contents of the link field. This vulnerability is patched in 4.1.1.

GitHub, Inc. AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

GitHub, Inc. CWE-79

GitHub, Inc. https://github.com/getkirby/kirby/commit/cda3dd9a15228d35e62ff86cfa87a67e7c687437 [No types assigned]

GitHub, Inc. https://github.com/getkirby/kirby/security/advisories/GHSA-63h4-w25c-3qv4 [No types assigned]