What’s Vulnerable › Vulnerabilities

CVE-2026-32257: Winter: Stored XSS through Brand Settings custom styles

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-26 · updated 2026-09-09
• Weakness: CWE-79

Description

Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Prior to 1.2.13, custom CSS supplied through the Brand Settings Styles field by a backend user with the backend.manage_branding permission is compiled by the LESS parser and rendered without sanitization on every backend page, allowing stored cross-site scripting against backend users. This issue is fixed in version 1.2.13.

Affected products

• wintercms winter: before 1.2.13

References

• https://github.com/wintercms/winter/commit/d28f0b9474af79cfaa80eeb9d691f7a7c4469720
• https://github.com/wintercms/winter/security/advisories/GHSA-v7cf-8gh9-gxmj

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