CVE-2026-31859
Craft has Reflective XSS via incomplete return URL sanitization
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 CWE-116 |
| Vendor | craftcms |
| Product | cms |
| Published | Mar 11, 2026 |
| Last Updated | Mar 12, 2026 |
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Affected Versions
craftcms / cms
>= 4.15.3, < 4.17.3 >= 5.7.5, < 5.9.7