What’s Vulnerable › Vulnerabilities

CVE-2026-55495: Cloudreve: Path Traversal in WOPI PUT_RELATIVE Allows Arbitrary File Creation in Owner Account

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-31 · updated 2026-09-08
• Weakness: CWE-22

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.

Affected products

• cloudreve: before 4.17.0

References

• https://github.com/cloudreve/cloudreve/commit/7968e50429efab40ffa8f57fecdfbd5a73d23630
• https://github.com/cloudreve/cloudreve/releases/tag/4.17.0
• https://github.com/cloudreve/cloudreve/security/advisories/GHSA-49h3-cwhj-4737
• https://github.com/cloudreve/cloudreve/security/advisories/GHSA-49h3-cwhj-4737

Get alerted when CVE-2026-55495 or the next vulnerability affects your stack