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TI-2026-24411 Aliases CVE-2026-31859GHSA-fvwq-45qv-xvhv

Craft has Reflective XSS via incomplete return URL sanitization

Priority LOW 36CWE-116Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00216 12th percentileScored 2026-11-08
Fix Fixed cms (craftcms): 4.17.3, 5.9.7craftcms/cms (Packagist): 4.17.3, 5.9.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Craft CMScms4.15.3 to before 4.17.3; 5.7.5 to before 5.9.74.17.3, 5.9.7Patch availableCNA
—craftcms/cms (Packagist)4.15.3 to before 4.17.34.17.3Patch availableGHSA-fvwq-45qv-xvhv
—craftcms/cms (Packagist)5.7.5 to before 5.9.75.9.7Patch availableGHSA-fvwq-45qv-xvhv
  • cms VendorCraft CMS Affected 4.15.3 to before 4.17.3; 5.7.5 to before 5.9.7 Fixed in 4.17.3, 5.9.7 Patch available CNA
  • craftcms/cms (Packagist) Vendor— Affected 4.15.3 to before 4.17.3 Fixed in 4.17.3 Patch available GHSA-fvwq-45qv-xvhv
  • craftcms/cms (Packagist) Vendor— Affected 5.7.5 to before 5.9.7 Fixed in 5.9.7 Patch available GHSA-fvwq-45qv-xvhv

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*4.15.3 to before 4.17.3; 5.7.5 to before 5.9.7VulnerableCraft CMS
  • cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:* Versions 4.15.3 to before 4.17.3; 5.7.5 to before 5.9.7 Vulnerable ·Craft CMS

Remediation

  • Fix · CNA cms (craftcms) Fixed in 4.17.3, 5.9.7
  • Fix · GHSA-fvwq-45qv-xvhv craftcms/cms (Packagist) Fixed in 4.17.3 Advisory →
  • Fix · GHSA-fvwq-45qv-xvhv craftcms/cms (Packagist) Fixed in 5.9.7 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-31859
  2. 2026-10-03 Alias added: GHSA-fvwq-45qv-xvhv

References

Patch 1

Advisory 1

Other 2

  • TI-2025-23503 Craft CMS Allows Remote Code Execution KEVCVSS 3.1CRITICAL 10.0
  • TI-2024-37138 RCE when PHP `register_argc_argv` config setting is enabled in craftcms/cms KEVCVSS 4.0CRITICAL 9.3
  • TI-2025-16994 Potential RCE with a compromised security key in craft/cms KEVCVSS 3.1HIGH 8.1
  • TI-2025-24595 Craft CMS stores user-provided content in session files KEVCVSS 4.0MEDIUM 6.9
  • TI-2023-22284 Craft CMS Remote Code Execution vulnerability CVSS 3.1CRITICAL 10.0
  • TI-2024-25171 Craft CMS up to v3.7.31 was discovered to contain a SQL injection vulnerability via the GraphQL API endpoint. CVSS 3.1CRITICAL 9.8
See all 96 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences