{"id":"CVE-2026-32257","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. Prior to 1.2.13, custom CSS supplied through the Brand Settings Styles field by a backend user with the backend.manage_branding permission …","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 <= 1.2.12"],"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-2026-32257","references":[{"url":"https://github.com/wintercms/winter/commit/d28f0b9474af79cfaa80eeb9d691f7a7c4469720","label":"security-advisories@github.com"},{"url":"https://github.com/wintercms/winter/security/advisories/GHSA-v7cf-8gh9-gxmj","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-v7cf-8gh9-gxmj"}],"tags":["nvd","ghsa","composer"],"epss":0.00215,"epssPercentile":0.12239,"aliases":["GHSA-v7cf-8gh9-gxmj"],"ecosystem":"composer","ingestedAt":"2026-08-12T14:53:00.806Z","slug":"CVE-2026-32257","body":"## Overview\n\nWinter 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-32257)\n\nAffected packages:\n\n- `winter/wn-backend-module <= 1.2.12`\n\nPatched in:\n\n- `winter/wn-backend-module 1.2.13`\n\nSource: https://github.com/advisories/GHSA-v7cf-8gh9-gxmj","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}