CVE-2026-55496: Cloudreve

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, GET /api/v4/user/search calls SearchActive without adding a StatusActive predicate and serializes matches at RedactLevelUser, allowing any logged-in user to enumerate email addresses and profile metadata for inactive or banned accounts. The service calls userClient.SearchActive, but despite its name that method filters only by email/nickname keyword and never adds a StatusActive predicate — while the sibling lookups GetActiveByID and GetActiveByDavAccount, defined a few lines above it, do. Search hits are serialized at RedactLevelUser, which includes the email address. This issue is fixed in version 4.17.0.

Affected products

• Cloudreve Cloudreve: version 4.17.0 only

Published 2026-07-31. Last modified 2026-09-08.