CVE-2026-79773 Winter CMS before 1.2.13 Local File Inclusion via JavaScript
Authenticated users with asset management permissions can read arbitrary server files, exposing sensitive credentials to unauthenticated visitors.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-79773?
CVE-2026-79773 is a medium-severity path traversal vulnerability in wintercms winter, published on 25 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Winter CMS before 1.2.13 contains a local file inclusion vulnerability in the JavascriptImporter filter that allows authenticated users with cms.manage_assets permission to disclose arbitrary server-readable files by placing =include or =require directives in theme JavaScript assets. Attackers can reference files like .env outside the theme directory, and the combined output served through the combine route becomes readable by unauthenticated visitors, exposing application keys and database credentials.
Weakness: CWE-22
Which versions are affected by CVE-2026-79773?
2 open source packages ship an affected version, including winter/wn-system-module.
| Package | Affected | Fixed in |
|---|---|---|
winter/wn-system-module Packagist | All versions | 1.2.13 |
winter/wn-system-module Packagist | All versions | 1.2.13 |
How do I fix CVE-2026-79773?
Upgrade winter/wn-system-module to 1.2.13 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-79773 being exploited?
There is no known exploitation of CVE-2026-79773 in the wild and no public exploit code.
Sources
Also known as GHSA-2223-f22x-24cq, GHSA-gqr6-9g7c-7g7r.