Description
Craft is a content management system (CMS). The fix for CVE-2025-35939 in craftcms/cms introduced a strip_tags() call in src/web/User.php to sanitize return URLs before they are stored in the session. However, strip_tags() only removes HTML tags (angle brackets) -- it does not inspect or filter URL schemes. Payloads like javascript:alert(document.cookie) contain no HTML tags and pass through strip_tags() completely unmodified, enabling reflected XSS when the return URL is rendered in an href attribute. This vulnerability is fixed in 5.9.7 and 4.17.3.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| craftcms | cms | >= 4.15.3, < 4.17.3, >= 5.7.5, < 5.9.7 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | craftcms/cms | >= 4.15.3, < 4.17.3 | 4.17.3 | GHSA-fvwq-45qv-xvhv |
| Packagist | craftcms/cms | >= 5.7.5, < 5.9.7 | 5.9.7 | GHSA-fvwq-45qv-xvhv |