---
id: CVE-2026-103476
title: >-
  yii2-starter-kit through 4.2.0 fails to validate article publication status in
  the attachment-download endpoint, allowing unauthenticated attackers to
  download files from draft articles
summary: >-
  yii2-starter-kit through 4.2.0 fails to validate article publication status in
  the attachment-download endpoint, allowing unauthenticated attackers to
  download files from draft articles. Attackers can enumerate sequential
  attachment iden…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-639
vendor: yii2-starter-kit
product: yii2-starter-kit
affected:
  - yii2-starter-kit <= 4.2.0
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T19:08:43.927'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103476'
references:
  - url: 'https://github.com/yii-starter-kit/yii2-starter-kit'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/yii-starter-kit/yii2-starter-kit/blob/cc2c451e8c959c7300b04efea597706a38609f58/frontend/controllers/ArticleController.php#L69
    label: disclosure@vulncheck.com
  - url: 'https://github.com/yii-starter-kit/yii2-starter-kit/issues/797'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/yii2-starter-kit-through-4.2.0-unauthorized-file-download-via-attachment-download
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-30T18:17:24.546Z'
---

## Overview

yii2-starter-kit through 4.2.0 fails to validate article publication status in the attachment-download endpoint, allowing unauthenticated attackers to download files from draft articles. Attackers can enumerate sequential attachment identifiers to retrieve files from unpublished articles without authentication or authorization checks.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.