Withdrawn Advisory This advisory has been withdrawn because the vendor reports that some HTML formatting (such as with an H1 element) is allowed, but there is backend sanitization such that the reporter's mentioned "injecting malicious scripts" would not occur.

Original Advisory An HTML injection vulnerability in the Edit Content Layout module of Kirby CMS v4.1.0 allows attackers to execute arbitrary code via a crafted payload.

A stored cross-site scripting (XSS) vulnerability in the Edit Content Layout module of Kirby CMS v4.1.0 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the Link field. NOTE: the vendor's position is that this issue did not affect any version of Kirby CMS. The only effect was on the trykirby.com demo site, which is not customer-controlled.