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Vulnerability record · CVE-2026-79774 · published 25 August 2026

CVE-2026-79774: Winter CMS versions before 1.2.13 contain an incomplete fix for a Twig sandbox escape vulnerability in System\…

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 4.0 Critical EPSS 0.81% · top 44.9% CWE-693 · CWE-693 Deferred
9.3CVSS 4.0 base score
0.81%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
31 Aug 2026Last modified by NVD

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.

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:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-79774), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.