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TI-2026-40051 Aliases CVE-2026-55499GHSA-w8x7-h2px-xmq8

Incorrect authorization in cloudreve

Priority MEDIUM 53CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00331 26th percentileScored 2026-11-07
Fix Fixed cloudreve (cloudreve): 4.17.0github.com/cloudreve/Cloudreve/v4 (Go): 4.0.0-20260613030215-0b00dd308f13

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
cloudrevecloudrevebefore 4.17.04.17.0Patch availableCNA
—github.com/cloudreve/Cloudreve/v4 (Go)before 4.0.0-20260613030215-0b00dd308f134.0.0-20260613030215-0b00dd308f13Patch availableGHSA-w8x7-h2px-xmq8
—github.com/cloudreve/Cloudreve/v3 (Go)up to 3.0.0-20250225100611-da4e44b77af4—No fix listedGHSA-w8x7-h2px-xmq8
  • cloudreve Vendorcloudreve Affected before 4.17.0 Fixed in 4.17.0 Patch available CNA
  • github.com/cloudreve/Cloudreve/v4 (Go) Vendor— Affected before 4.0.0-20260613030215-0b00dd308f13 Fixed in 4.0.0-20260613030215-0b00dd308f13 Patch available GHSA-w8x7-h2px-xmq8
  • github.com/cloudreve/Cloudreve/v3 (Go) Vendor— Affected up to 3.0.0-20250225100611-da4e44b77af4 Fixed in — No fix listed GHSA-w8x7-h2px-xmq8

Remediation

  • Fix · CNA cloudreve (cloudreve) Fixed in 4.17.0
  • Fix · GHSA-w8x7-h2px-xmq8 github.com/cloudreve/Cloudreve/v4 (Go) Fixed in 4.0.0-20260613030215-0b00dd308f13 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55499
  2. 2026-10-03 Alias added: GHSA-w8x7-h2px-xmq8

References

Other 4

  • TI-2026-65089 Cloudreve before 4.16.1 Authentication Bypass via Cached Context Hint CVSS 4.0MEDIUM 6.9
  • TI-2026-39397 Cloudreve: OAuth access tokens bypass scope enforcement due to missing client_id claim CVSS 3.1HIGH 7.6
  • TI-2026-40054 Cloudreve: OAuth Admin.Read scope can update OneDrive storage policy credentials CVSS 3.1HIGH 7.1
  • TI-2026-39400 Incorrect authorization in cloudreve CVSS 3.1HIGH 7.1
  • TI-2026-40050 Cloudreve: Server crash through image decompression/pixel bomb in thumbnail & avatar decoding (DoS) CVSS 3.1MEDIUM 6.5
  • TI-2026-39399 Cloudreve: Non-admin remote download users can SSRF loopback/internal services and read imported responses CVSS 3.1MEDIUM 6.5
See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences