yii2-starter-kit through 4.2.0 Unrestricted File Upload RCE (CVE-2026-103474) | HOL Guard CVE

High · CVSS 8.7CVE-2026-103474

yii2-starter-kit through 4.2.0 Unrestricted File Upload RCE

Answer in brief

CVE-2026-103474 records a High severity (CVSS 8.7) vulnerability in yii2-starter-kit through 4.2.0 Unrestricted File Upload RCE. The current sources do not mark it as known exploited. The current feed maps yii2-starter-kit/yii2-starter-kit (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 Sep 30, 2026Updated Sep 30, 2026Source checked Sep 30, 2026First seen by HOL Sep 30, 2026Material review Sep 30, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.7
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.7. 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 yii2-starter-kit/yii2-starter-kit (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
yii2-starter-kit/yii2-starter-kitgeneric	>=0 <=4.2.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for yii2-starter-kit/yii2-starter-kit.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 30, 2026

Sources and claim methodology

Upstream source description

yii2-starter-kit through 4.2.0 fails to validate file types in the backend storage upload actions, allowing authenticated managers to upload PHP files. Attackers with manager role can upload PHP scripts to the web-accessible storage directory and request them to execute arbitrary code on the server.

Quoted source text, attributed separately from HOL analysis.