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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55499
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-31 04:17:23 UTC
Updated2026-08-01 00:17:17 UTC
DescriptionCloudreve 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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

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

EPSS: 0.003310000 probability, percentile 0.256380000 (date 2026-08-04)

Problem Types: CWE-863 | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cloudreve Cloudreve affected < 4.17.0 Not specified

References

ReferenceSourceLinkTags
github.com/cloudreve/cloudreve/security/advisories/GHSA-w8x7-h2px-xmq8 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/cloudreve/cloudreve/commit/0b00dd308f132d6e6e8476857ef79f4865... [email protected] github.com
github.com/cloudreve/cloudreve/releases/tag/4.17.0 [email protected] github.com
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