Path Traversal in Wintercms Winter
CVE-2026-79773
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/wintercms/winter/security/advisories/GHSA-2223-f22x-24cq (vendor-advisory)
- github.com/wintercms/winter/commit/e09c8d3526f3583cb6c3476a021b885088ecd4bd (patch)
- github.com/wintercms/winter/commit/fd673f4f32140c97c68b1ed705764b819747fbdf (patch)
- www.vulncheck.com/advisories/winter-cms-before-local-file-inclusion-via-javascr… (third-party-advisory)
- github.com/wintercms/storm/commit/fd673f4f32140c97c68b1ed705764b819747fbdf (patch)
Frequently asked questions
- What is CVE-2026-79773?
- CVE-2026-79773 is a medium-severity vulnerability in Wintercms Winter, classified under Path Traversal. CVSS score: 4.9/10. Published 2026-08-25.
- How severe is CVE-2026-79773?
- Medium severity. CVSS v3 base score is 4.9 out of 10.