Stored Cross-Site Scripting Vulnerability in Winter CMS by Winter
CVE-2026-32258

8.1HIGH

Key Information:

Vendor

Wintercms

Status
Winter
Vendor
CVE Published:
26 August 2026

What is CVE-2026-32258?

Winter CMS, an open-source content management system built on the Laravel PHP framework, contains a vulnerability that allows authenticated backend users, with the 'backend.manage_editor' permission, to create and store custom Markup Styles. The LESS parser compiles these styles without proper sanitization, leading to stored cross-site scripting (XSS) on every backend page. This vulnerability affects versions 1.2.10 through 1.2.12 and has been addressed in version 1.2.13.

Affected Version(s)

winter >= 1.2.10, < 1.2.13

References

https://github.com/wintercms/winter/security/advisories/G...
x_refsource_CONFIRM
https://github.com/wintercms/winter/commit/d28f0b9474af79...
x_refsource_MISC

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.