What’s Vulnerable › Vulnerabilities

CVE-2026-55417: Chevereto private profile setting leaks username on /json endpoint

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-07 · updated 2026-07-10
• Weakness: CWE-862

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.

Affected products

• chevereto: from 3.7.5, < 4.5.4
• chevereto/chevereto: from 4.0.5, < 4.5.4
• chevereto rodber/chevereto-free: from 1.0.0

References

• https://chevereto.com/community/threads/chevereto-v4-5-4-announcement.16398/post-80153
• https://github.com/chevereto/chevereto/security/advisories/GHSA-h4jp-mxfx-g8xp
• https://github.com/chevereto/chevereto/security/advisories/GHSA-h4jp-mxfx-g8xp

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