Medium severity · published Aug 25, 2026
CVE-2026-79773
Winter CMS before 1.2.13 Local File Inclusion via JavaScript
4.9
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WI
winter · wintercms
before 1.2.13 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-79773
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-79773
vendor-advisory
https://github.com/wintercms/winter/security/advisories/GHSA-2223-f22x-24cq
patch
https://github.com/wintercms/winter/commit/e09c8d3526f3583cb6c3476a021b885088ecd4bd
patch
https://github.com/wintercms/storm/commit/fd673f4f32140c97c68b1ed705764b819747fbdf
third-party-advisory
https://www.vulncheck.com/advisories/winter-cms-before-local-file-inclusion-via-javascript
More from winter
9.9
CVE-2026-27591
Winter: Privilege escalation by authenticated backend users
9.8
CVE-2022-39357
Winter vulnerable to Prototype Pollution in Snowboard framework
8.4
CVE-2026-79774
Winter CMS before 1.2.13 Twig Sandbox Escape via SecurityPolicy
8.4
CVE-2024-54149
Winter CMS Modules allows a sandbox bypass in Twig templates leading to data modification and deletion
8.1
CVE-2026-32258
Winter: Stored XSS through Editor Settings custom styles