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TI-2026-39399 Aliases CVE-2026-54562GHSA-x756-g4x3-c64m

Cloudreve: Non-admin remote download users can SSRF loopback/internal services and read imported responses

Priority MEDIUM 62CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-918 and the CVSS impact.

Summary

Cloudreve is a self-hosted file management and sharing system. Prior to 4.16.1, Cloudreve's remote download workflow accepts user-supplied URLs at POST /api/v4/workflow/download and passes them to the configured downloader without blocking loopback, localhost, IPv6 localhost, or redirect-to-loopback targets, allowing a non-admin user with remote download permission to fetch internal-only URLs and read the response after it is imported into the user's own files. This issue is fixed in version 4.16.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00402 34th percentileScored 2026-11-07
Fix Fixed cloudreve (cloudreve): 4.16.1github.com/cloudreve/Cloudreve/v4 (Go): 4.0.0-20260606025411-aaebf317a78f

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 4.16.14.16.1Patch availableCNA
—github.com/cloudreve/Cloudreve/v4 (Go)before 4.0.0-20260606025411-aaebf317a78f4.0.0-20260606025411-aaebf317a78fPatch availableGHSA-x756-g4x3-c64m
—github.com/cloudreve/Cloudreve/v3 (Go)up to 3.0.0-20250225100611-da4e44b77af4—No fix listedGHSA-x756-g4x3-c64m
  • cloudreve Vendorcloudreve Affected before 4.16.1 Fixed in 4.16.1 Patch available CNA
  • github.com/cloudreve/Cloudreve/v4 (Go) Vendor— Affected before 4.0.0-20260606025411-aaebf317a78f Fixed in 4.0.0-20260606025411-aaebf317a78f Patch available GHSA-x756-g4x3-c64m
  • github.com/cloudreve/Cloudreve/v3 (Go) Vendor— Affected up to 3.0.0-20250225100611-da4e44b77af4 Fixed in — No fix listed GHSA-x756-g4x3-c64m

Remediation

  • Fix · CNA cloudreve (cloudreve) Fixed in 4.16.1
  • Fix · GHSA-x756-g4x3-c64m github.com/cloudreve/Cloudreve/v4 (Go) Fixed in 4.0.0-20260606025411-aaebf317a78f Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54562
  2. 2026-10-03 Alias added: GHSA-x756-g4x3-c64m

References

Advisory 1

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-2026-44495 Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored CVSS 3.1MEDIUM 6.3
See all 16 →

Sources

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