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.

INFO

Published Date :

2026-03-11T17:37:19.065Z

Last Modified :

2026-03-12T14:00:23.631Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-31859 vulnerability.

Vendors Products
Craftcms
  • Craft Cms
  • Craftcms
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-31859.

URL Resource
https://github.com/craftcms/cms/security/advisories/GHSA-fvwq-45qv-xvhv cve-icon cve-icon
Login to claim this CVE

CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact