Moderate severityNVD Advisory· Published Jul 31, 2026· Updated Jul 31, 2026
Cloudreve: Broken access control in file event stream leaks activity events for unshared siblings to single-file share recipients
CVE-2026-55499
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/cloudreve/Cloudreve/v4Go | < 4.0.0-20260613030215-0b00dd308f13 | 4.0.0-20260613030215-0b00dd308f13 |
github.com/cloudreve/Cloudreve/v3Go | <= 3.0.0-20250225100611-da4e44b77af4 | — |
Affected products
1Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-w8x7-h2px-xmq8ghsaADVISORY
- github.com/cloudreve/cloudreve/commit/0b00dd308f132d6e6e8476857ef79f4865600bbcghsax_refsource_MISCWEB
- github.com/cloudreve/cloudreve/releases/tag/4.17.0ghsax_refsource_MISCWEB
- github.com/cloudreve/cloudreve/security/advisories/GHSA-w8x7-h2px-xmq8ghsax_refsource_CONFIRMWEB
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