Cloudreve up to 4.16.x WOPI PUT_RELATIVE X-WOPI-SuggestedTarget path traversal

Summaryinfo

A vulnerability was found in Cloudreve up to 4.16.x. It has been rated as critical. This issue affects the function WOPI PUT_RELATIVE. Performing a manipulation of the argument X-WOPI-SuggestedTarget results in path traversal. This vulnerability was named CVE-2026-55495. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in Cloudreve up to 4.16.x. This affects the function WOPI PUT_RELATIVE. The manipulation of the argument X-WOPI-SuggestedTarget with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-55495 since 06/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 4.17.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Cloud Software

Name

• Cloudreve

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16

Website

• Product: https://github.com/cloudreve/cloudreve/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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