CVE-2026-103476 yii2-starter-kit through 4.2.0 Unauthorized File Download via attachment-download
Unauthenticated attackers can download files from unpublished articles by enumerating attachment IDs due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103476?
CVE-2026-103476 is a medium-severity missing authorization vulnerability in yii2-starter-kit, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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 Attackers can enumerate sequential attachment identifiers to retrieve files from unpublished articles without authentication or authorization checks.
Weakness: CWE-639
Which versions are affected by CVE-2026-103476?
How do I fix CVE-2026-103476?
No fix has been published for CVE-2026-103476 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-103476 being exploited?
There is no known exploitation of CVE-2026-103476 in the wild and no public exploit code.
Sources
Also known as GHSA-75rg-6mfq-67qw.