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Winter CMS CVE-2026-79774

| EUVDEUVD-2026-65532 CRITICAL
Protection Mechanism Failure (CWE-693)
2026-08-25 VulnCheck GHSA-gw97-553p-fp3j
PHP RCE Winter
9.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.3 CRITICAL
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
vuln.today AI
9.1 CRITICAL

PR:H because exploitation needs a trusted backend account with template-editing permissions; AV:N/AC:L for the reachable backend; S:C and C/I/A:H because the sandbox escape yields DB compromise and server RCE.

3.1 AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
P
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 25, 2026 - 16:07 vuln.today
Analysis Generated
Aug 25, 2026 - 16:07 vuln.today
CVE Published
Aug 25, 2026 - 15:16 cve.org
CRITICAL 9.3

DescriptionCVE.org

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.

Articles & Coverage 1

News Critical Twig Sandbox Escape in Winter CMS before 1.2.13 - CVE-2026-79774 Aug 26, 2026

AnalysisAI

Authenticated Twig sandbox escape in Winter CMS before 1.2.13 lets backend users holding template-editing permissions (cms.manage_pages, cms.manage_layouts, or cms.manage_partials) break out of the CMS 'safe mode' to read and modify arbitrary database records, run raw SQL including DDL like DROP TABLE, exfiltrate backend administrator credentials, and achieve PHP remote code execution by writing PHP into a page, layout, or partial code section. It is an incomplete-fix follow-up (bypass) of CVE-2024-54149, whose method-name blocklist missed Eloquent's __call forwarding to the query builder. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to backend with template-edit permission
Delivery
Craft Twig payload escaping SecurityPolicy
Exploit
Forward call through Eloquent model to query builder
Execution
Inject PHP into page/layout code section
Impact
Render page to execute code and dump credentials
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Vulnerability AssessmentAI

Exploitation Requires an authenticated Winter CMS backend account holding at least one of the CMS template-editing permissions cms.manage_pages, cms.manage_layouts, or cms.manage_partials - these are the exact prerequisites named in the advisory. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score is 9.3, driven by network reachability of the backend (AV:N/AC:L) and full confidentiality/integrity/availability impact including scope/subsequent-system compromise via RCE. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who controls a backend account with cms.manage_pages (for example an over-privileged content editor or a phished developer login) edits a CMS page and inserts a Twig payload that forwards through an Eloquent model to the query builder - e.g. writing PHP into the page's own code section via a newQuery().update({ code: "<?php ... …
Remediation Vendor-released patch: v1.2.13 - upgrade the winter/wn-system-module package to 1.2.13 (fix commit 725bbcda232466f7f71381c271c6916573d576e6), per advisory GHSA-8cfw-pcwh-v63w (https://github.com/wintercms/winter/security/advisories/GHSA-8cfw-pcwh-v63w). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify and audit all users holding cms.manage_pages, cms.manage_layouts, or cms.manage_partials permissions, and review their recent template modifications for suspicious activity. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-79774 vulnerability details – vuln.today
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