What is CVE-2026-32258?

CVE-2026-32258 is a high-severity vulnerability in Wintercms Winter, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2026-08-26.

How severe is CVE-2026-32258?

High severity. CVSS v3 base score is 8.1 out of 10.

XSS in Wintercms Winter

CVE-2026-32258

Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. From 1.2.10 through 1.2.12, authenticated backend users with the backend.manage_editor permission can store custom Markup Styles that are compiled by the LESS parser and rendered without sanitization on every backend page, allowing stored cross-site scripting. This issue is fixed in version 1.2.13.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N.

Affected products

Wintercms Winter — versions >= 1.2.10, < 1.2.13

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-32258?: CVE-2026-32258 is a high-severity vulnerability in Wintercms Winter, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2026-08-26.
How severe is CVE-2026-32258?: High severity. CVSS v3 base score is 8.1 out of 10.