---
id: CVE-2026-32258
title: >-
  Winter is a free, open-source content management system (CMS) based on the
  Laravel PHP framework
summary: >-
  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 c…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N'
cwe:
  - CWE-79
vendor: winter
product: winter/wn-backend-module
affected:
  - 'winter/wn-backend-module >= 1.2.10, < 1.2.13'
patched:
  - winter/wn-backend-module 1.2.13
published: '2026-08-26'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-32258'
references:
  - url: >-
      https://github.com/wintercms/winter/commit/d28f0b9474af79cfaa80eeb9d691f7a7c4469720
    label: security-advisories@github.com
  - url: >-
      https://github.com/wintercms/winter/security/advisories/GHSA-vgp4-2fc4-qff2
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-vgp4-2fc4-qff2'
tags:
  - nvd
  - ghsa
  - composer
epss: 0.00215
epssPercentile: 0.12239
aliases:
  - GHSA-vgp4-2fc4-qff2
ecosystem: composer
ingestedAt: '2026-08-12T14:53:00.758Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-32258)

Affected packages:

- `winter/wn-backend-module >= 1.2.10, < 1.2.13`

Patched in:

- `winter/wn-backend-module 1.2.13`

Source: https://github.com/advisories/GHSA-vgp4-2fc4-qff2