CVE-2026-55417 Chevereto private profile setting leaks username on /json endpoint
Unauthenticated attackers can retrieve private usernames and public images via the JSON endpoint, bypassing profile privacy settings.
- 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-2026-55417?
CVE-2026-55417 is a medium-severity vulnerability in chevereto, published on 7 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-55417?
How do I fix CVE-2026-55417?
No fix has been published for CVE-2026-55417 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-55417 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55417 exists.
Sources
Also known as GHSA-h4jp-mxfx-g8xp.