CVE-2026-31859
Published: Mar 11, 2026
Modified: Mar 12, 2026
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.
| Vendor | Product | Versions |
|---|---|---|
craftcms | cms | affected >= 4.15.3, < 4.17.3affected >= 5.7.5, < 5.9.7 |
References
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