What’s Vulnerable › Vulnerabilities

CVE-2026-103476: yii2-starter-kit through 4.2.0 Unauthorized File Download via attachment-download

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-30 · updated 2026-10-01
• Weakness: CWE-639

Description

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 Attackers can enumerate sequential attachment identifiers to retrieve files from unpublished articles without authentication or authorization checks.

Affected products

• yii2-starter-kit: through 4.2.0

References

• https://github.com/yii-starter-kit/yii2-starter-kit
• https://github.com/yii-starter-kit/yii2-starter-kit/blob/cc2c451e8c959c7300b04efea597706a38609f58/frontend/controllers/ArticleController.php#L69
• https://github.com/yii-starter-kit/yii2-starter-kit/issues/797
• https://www.vulncheck.com/advisories/yii2-starter-kit-through-4.2.0-unauthorized-file-download-via-attachment-download

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