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High, CVSS 8.4amended

Winter: Authenticated Twig sandbox escape in CMS SecurityPolicy (bypass of CVE-2024-54149)

CVE-2026-79774GHSA-8cfw-pcwh-v63w

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (winter/wn-system-module 1.2.13), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.4 · CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
EPSS
  • CVE-2026-79774: 0.81% estimated exploitation activity in the next 30 days; percentile 56.90 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact Affected versions of Winter CMS allow authenticated backend users with CMS template-editing permissions to escape the Twig sandbox ("safe mode") that is meant to restrict what template code can do. Using any of the following permissions, an attacker can read and modify arbitrary database records, execute arbitrary SQL (including DDL such as DROP TABLE), exfiltrate sensitive data such as backend administrator credentials, and achieve remote code execution by injecting PHP into a CMS page, layout, or partial code section: - cms.managepages - cms.managelayouts - cms.managepartials This is an incomplete-fix follow-up to CVE-2024-54149 (GHSA-xhw3-4j3m-hq53). That fix added a blocklist of dangerous methods to System\Twig\SecurityPolicy, but the blocklist missed a large number of equivalent methods and did not account for the way Eloquent models forward calls to the query builder. As a result the sandbox could be bypassed through — among others — saveQuietly()/deleteQuietly(),…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-8cfw-pcwh-v63w

  2. Revision 1 · created ·

    Published from osv record GHSA-8cfw-pcwh-v63w

Agent brief

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# Patch Next advisory brief: CVE-2026-79774

Advisory: Winter: Authenticated Twig sandbox escape in CMS SecurityPolicy (bypass of CVE-2024-54149)
IDs: CVE-2026-79774, GHSA-8cfw-pcwh-v63w
Record: https://patchnext.com/advisories/cve-2026-79774 (revision 2, source checked 26 Oct 2026, 14:53 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: winter/wn-system-module 1.2.13. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist winter/wn-system-module: affected >= 1.2.7, < 1.2.13; fixed in 1.2.13

## Suggested inspection (read-only)
- Packagist winter/wn-system-module: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on winter/wn-system-module.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-8cfw-pcwh-v63w (OSV record GHSA-8cfw-pcwh-v63w lists affected ranges: Packagist winter/wn-system-module >=1.2.7 <1.2.13 (fixed))
- Verified: https://github.com/advisories/GHSA-8cfw-pcwh-v63w (GitHub-reviewed advisory GHSA-8cfw-pcwh-v63w lists affected ranges: Packagist winter/wn-system-module >=1.2.7 <1.2.13)

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