What’s Vulnerable › Vulnerabilities

CVE-2026-79773: Winter CMS before 1.2.13 Local File Inclusion via JavaScript

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-25 · updated 2026-10-08
• Weakness: CWE-22

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.

Affected products

• wintercms winter: before 1.2.13 — fixed in 1.2.13

How to fix

Upgrade to a fixed version: wintercms winter 1.2.13. Check the vendor advisory for mitigations.

References

• https://github.com/wintercms/storm/commit/fd673f4f32140c97c68b1ed705764b819747fbdf
• https://github.com/wintercms/winter/commit/e09c8d3526f3583cb6c3476a021b885088ecd4bd
• https://github.com/wintercms/winter/security/advisories/GHSA-2223-f22x-24cq
• https://www.vulncheck.com/advisories/winter-cms-before-local-file-inclusion-via-javascript

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