CVE-2026-79774

critical · 9.3

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.

9.3

CVSS

0.8%

EPSS (exploit prob.)

57th

EPSS percentile

2026-08-25

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-693

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-79774