CVE-2026-55499

Cloudreve: Broken access control in file event stream leaks activity events for unshared siblings to single-file share recipients

Published Jul 31, 2026 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Description
Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, a single-file share event-stream subscription resolves the share root to the owner’s parent folder and subscribes to that folder topic, allowing an authenticated share recipient to receive names, paths, rename targets, event types, and hashed identifiers for unshared sibling files and folders. This issue is fixed in version 4.17.0.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-w8x7-h2px-xmq8 Cloudreve: Broken Access Control in file event stream: a single-file share recipient is subscribed to the owner's parent folder and receives activity events for unshared siblings
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Cloudreve
Cloudreve cloudreve
Vendors & Products Cloudreve
Cloudreve cloudreve
Type Values Removed Values Added
Description Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, a single-file share event-stream subscription resolves the share root to the owner’s parent folder and subscribes to that folder topic, allowing an authenticated share recipient to receive names, paths, rename targets, event types, and hashed identifiers for unshared sibling files and folders. This issue is fixed in version 4.17.0.
Title Cloudreve: Broken access control in file event stream leaks activity events for unshared siblings to single-file share recipients
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 31, 2026, 11:15 PM
Reserved
Jun 16, 2026, 10:28 PM
Status
Deferred
Published
Jul 31, 2026, 4:17 AM
Modified
Sep 8, 2026, 8:51 PM