CVE-2026-103476

Medium

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 Attackers can enumerate sequential attachment identifiers to retrieve files from unpublished articles without authentication or authorization checks.

SeverityMedium

CVSS5.3

Exploit probability—

ProductYii2-starter-kit

PublishedSep 30, 2026

First seenSep 30, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Sources list no fixed version or patch link for this vulnerability.

Affected products

Product	Affected versions	Fixed in
yii2-starter-kit yii2-starter-kit	v ≤ 4.2.0	—

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