High severity · published Aug 26, 2026
CVE-2026-32258
Winter: Stored XSS through Editor Settings custom styles
8.1
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WI
winter · wintercms
>= 1.2.10, < 1.2.13 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-32258
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-32258
github.com
https://github.com/wintercms/winter/commit/d28f0b9474af79cfaa80eeb9d691f7a7c4469720
github.com
https://github.com/wintercms/winter/security/advisories/GHSA-vgp4-2fc4-qff2
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