GHSA-8cfw-pcwh-v63w: winter/wn-system-module (CVE-2026-79774)

Package	Ecosystem	Affected	Fixed in
winter/wn-system-module	Packagist	>=1.2.7, <1.2.13	1.2.13

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Winter CMS package winter/wn-system-module, versions 1.2.7 up to but not including 1.2.13, has a Twig sandbox escape in its CMS SecurityPolicy that is an incomplete fix for CVE-2024-54149. An authenticated backend user holding the cms.manage_pages, cms.manage_layouts, or cms.manage_partials permission could use it to modify database records, run arbitrary SQL, obtain administrator credentials, or execute PHP code. Upgrade to version 1.2.13 and clear the compiled Twig template cache afterwards; if upgrading is not possible, limit those permissions to fully trusted administrators.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.3	Critical	4.0	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	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0081, the 57th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:07 UTC First seen by agentprime
31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.