Winter CMS before 1.2.13 Twig Sandbox Escape via SecurityPolicy (CVE-2026-79774) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-79774

Winter CMS before 1.2.13 Twig Sandbox Escape via SecurityPolicy

Answer in brief

CVE-2026-79774 records a Unknown severity vulnerability in Winter CMS before 1.2.13 Twig Sandbox Escape via SecurityPolicy. The current sources do not mark it as known exploited. The current feed maps wintercms/winter (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 25, 2026Updated Aug 25, 2026Source checked Aug 25, 2026First seen by HOL Aug 25, 2026Material review Aug 25, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps wintercms/winter (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
wintercms/wintergeneric	>=1.2.7 <1.2.13	1.2.13

Recommended response

Check inventory. Check lockfiles and deployed manifests for wintercms/winter.
Review the reported fix. Update wintercms/winter to 1.2.13 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 25, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.