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TI-2026-40048 Aliases CVE-2026-55495GHSA-49h3-cwhj-4737

Cloudreve: Path Traversal in WOPI PUT_RELATIVE Allows Arbitrary File Creation in Owner Account

Priority MEDIUM 53CWE-22Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, the WOPI PUT_RELATIVE handler passes X-WOPI-SuggestedTarget to URI.JoinRaw as a path rather than a filename, allowing slash and dot-dot segments to escape the source file directory and create or conditionally overwrite files elsewhere in the same owner account. This issue is fixed in version 4.17.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00376 31st percentileScored 2026-11-07
Fix Fixed cloudreve (cloudreve): 4.17.0github.com/cloudreve/Cloudreve/v4 (Go): 4.0.0-20260613023150-7968e50429ef

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 4.0.0-20260613023150-7968e50429ef4.0.0-20260613023150-7968e50429efPatch availableGHSA-49h3-cwhj-4737
—github.com/cloudreve/Cloudreve/v3 (Go)up to 3.0.0-20250225100611-da4e44b77af4—No fix listedGHSA-49h3-cwhj-4737
  • cloudreve Vendorcloudreve Affected before 4.17.0 Fixed in 4.17.0 Patch available CNA
  • github.com/cloudreve/Cloudreve/v4 (Go) Vendor— Affected before 4.0.0-20260613023150-7968e50429ef Fixed in 4.0.0-20260613023150-7968e50429ef Patch available GHSA-49h3-cwhj-4737
  • github.com/cloudreve/Cloudreve/v3 (Go) Vendor— Affected up to 3.0.0-20250225100611-da4e44b77af4 Fixed in — No fix listed GHSA-49h3-cwhj-4737

Remediation

  • Fix · CNA cloudreve (cloudreve) Fixed in 4.17.0
  • Fix · GHSA-49h3-cwhj-4737 github.com/cloudreve/Cloudreve/v4 (Go) Fixed in 4.0.0-20260613023150-7968e50429ef Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55495
  2. 2026-10-03 Alias added: GHSA-49h3-cwhj-4737

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