CVE-2026-55417: Chevereto

Medium severity, CVSS 6.9. EPSS: 0.4% chance of exploitation in the next 30 days.

Chevereto is a self-hosted media-sharing platform. Starting in version 3.7.5 and prior to version 4.5.4, when a user enables the private profile option, visiting their profile HTML route (`/username`) correctly returns 404. However, the `/json` AJAX listing endpoint does not apply the same check. An unauthenticated caller who knows the target's user ID can retrieve all of that user's publicly-scoped images, revealing the username (which should be private). This is patched in Chevereto v4.5.4. No known workarounds are available.

Affected products

• Chevereto Chevereto: from 3.7.5, before 4.5.4 (fixed in 4.5.4)
• Chevereto Chevereto/chevereto: from 4.0.5, before 4.5.4 (fixed in 4.5.4)
• Chevereto Rodber/chevereto-Free: from 1.0.0

Published 2026-07-07. Last modified 2026-07-10.