CVE-2026-55499

MEDIUM 4.3

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

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-863
Vendor	cloudreve
Product	cloudreve
Published	Jul 31, 2026

Stay Ahead of the Next One

Get instant alerts for cloudreve cloudreve

Be the first to know when new medium vulnerabilities affecting cloudreve cloudreve are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

cloudreve / cloudreve

< 4.17.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/cloudreve/cloudreve/security/advisories/GHSA-w8x7-h2px-xmq8 github.com: https://github.com/cloudreve/cloudreve/commit/0b00dd308f132d6e6e8476857ef79f4865600bbc github.com: https://github.com/cloudreve/cloudreve/releases/tag/4.17.0