# CVE-2026-79774

## Summary

- **CVE ID:** CVE-2026-79774
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H)
- **CWE:** CWE-693
- **Published:** Aug 25, 2026
- **Last Modified:** Aug 26, 2026

## Description

Winter CMS versions before 1.2.13 contain an incomplete fix for a Twig sandbox escape vulnerability in System\\Twig\\SecurityPolicy that allows authenticated backend users with template-editing permissions to bypass sandbox restrictions. Attackers can exploit method forwarding through Eloquent models and query builders using methods like saveQuietly(), deleteQuietly(), increment(), decrement(), and newQuery() to read and modify arbitrary database records, execute arbitrary SQL, and achieve remote code execution by injecting PHP into template code sections.

## Affected Products

- wintercms — winter (1.2.7)
- wintercms — winter (1.2.13)

## References

- [CNA](https://github.com/wintercms/winter/security/advisories/GHSA-8cfw-pcwh-v63w)
- [CNA](https://github.com/wintercms/winter/commit/725bbcda232466f7f71381c271c6916573d576e6)
- [CNA](https://www.vulncheck.com/advisories/winter-cms-before-twig-sandbox-escape-via-securitypolicy)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.43%
- **EPSS Percentile:** 36.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._