Reflected XSS Vulnerability in Craft Content Management System
CVE-2026-31859

6.9MEDIUM

Key Information:

Vendor

Craftcms

Status
Cms
Vendor
CVE Published:
11 March 2026

What is CVE-2026-31859?

A reflected XSS vulnerability has been identified in Craft CMS due to improper URL sanitization. The issue arises from a strip_tags() function implemented to filter return URLs, which only removes HTML tags and fails to address URL schemes. Consequently, malicious payloads can be executed, allowing attackers to inject JavaScript into return URLs that are rendered within href attributes, potentially compromising user sessions and sensitive information.

Affected Version(s)

cms >= 4.15.3, < 4.17.3 < 4.15.3, 4.17.3

cms >= 5.7.5, < 5.9.7 < 5.7.5, 5.9.7

References

https://github.com/craftcms/cms/security/advisories/GHSA-...
x_refsource_CONFIRM

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.