Username disclosure via unchecked JSON image listing
Published Jul 7, 2026 · Updated Jul 7, 2026
Missing authorization in Chevereto 3.7.5 through 4.5.3 and Chevereto Free 1.0.0 and later allows remote attackers to disclose usernames. The /json image-listing endpoint omits the private-profile check enforced by the HTML profile route and returns the owner's username with public-image metadata. Exploitation requires a private profile, its encoded user ID, and a page-supplied CSRF token; the reported consequence is disclosure, not image modification.
Summary
What happened
Missing authorization in Chevereto 3.7.5 through 4.5.3 and Chevereto Free 1.0.0 and later allows remote attackers to disclose usernames. The /json image-listing endpoint omits the private-profile check enforced by the HTML profile route and returns the owner's username with public-image metadata. Exploitation requires a private profile, its encoded user ID, and a page-supplied CSRF token; the reported consequence is disclosure, not image modification.
The record
- CVE
- CVE-2026-55417
- Published
- Jul 7, 2026
- Updated
- Jul 7, 2026
- Vendor
- Chevereto
- Product
- Chevereto
- Classifications
- CWE-862, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 7, 2026CVE publishedPublication date reported by the CVE source.
- Jul 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 3.7.5, < 4.5.4
- Affected versionversion=>= 4.0.5, < 4.5.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- GHSA-h4jp-mxfx-g8xp proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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