CVE-2026-55495 Details
Description
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.
A path traversal vulnerability has been identified in Cloudreve versions prior to 4.17.0. The issue arises in the WOPI PUT_RELATIVE handler, which incorrectly treats the X-WOPI-SuggestedTarget header as a file path instead of a filename. This misinterpretation allows for slash and dot-dot segments to escape the source file directory, enabling the creation or conditional overwriting of files in other locations within the same owner account. The vulnerability exists because the upload path validation only checks the final, cleaned basename of the file, after harmful traversal segments have already been resolved and escaped.
Users should update to Cloudreve version 4.17.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 31, 2026CISA-ADP
Assessed Jul 31, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/cloudreve/cloudreve/security/advisories/GHSA-49h3-cwhj-4737 | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/cloudreve/cloudreve/commit/7968e50429efab40ffa8f57fecdfbd5a73d23630 | [email protected] | Source CodeVendor |
| https://github.com/cloudreve/cloudreve/releases/tag/4.17.0 | [email protected] | Release NotesVendor |
| https://github.com/cloudreve/cloudreve/security/advisories/GHSA-49h3-cwhj-4737 | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Cloudreve | < 4.16.1 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 31, 2026 | CVE Modified | CISA-ADP |
| Jul 31, 2026 | New CVE Received | [email protected] |