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    CVE-2026-31859

    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.

    Published:Mar 11, 2026
    Last Modified:Mar 20, 2026
    EPS:Mar 11, 2026
    EPSS Score:0.00033
    CVSS Score:6.1

    Affected Products

    Vendor
    Craftcms
    Product
    Craft Cms
    Vendor
    Craftcms
    Product
    Craftcms

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-86730 (CVSS 8.7) — Craft CMS versions before 5.10.12 fail to properly cleanse string-typed field-layout elements, allowing authen…
    CVE-2026-84802 (CVSS 5.3) — Craft CMS versions from 5.7.0 before 5.10.12 contain an information disclosure vulnerability in AssetsControll…
    CVE-2026-84801 (CVSS 8.7) — Craft CMS versions before 5.10.11 fail to validate admin status in the actionGetPasswordResetUrl endpoint, all…
    CVE-2026-84800 (CVSS 7.1) — Craft CMS versions >= 5.0.0-RC1 and < 5.10.11 contain a missing authorization vulnerability in AssetsControlle…
    CVE-2026-84799 (CVSS 5.3) — Craft CMS before 5.11.0 fails to enforce user-group scope filters on native GraphQL user relations including a…
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    CVE-2026-84797 (CVSS 5.3) — Craft CMS versions before 5.10.11 contain an authorization bypass vulnerability in ElementsController::actionD…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High