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CVE-2026-55495

4.3 · MEDIUM

Cloudreve is a self-hosted file management and sharing system.

Published Jul 31, 2026CWE-22EPSS 0.38%

Overview

CVE-2026-55495 is a medium-severity vulnerability. It was published on July 31, 2026 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/cloudreve/cloudreve/commit/7968e50429efab40ffa8f57fecdfbd5a73d23630GitHubgithub.com/cloudreve/cloudreve/releases/tag/4.17.0GitHubgithub.com/cloudreve/cloudreve/security/advisories/GHSA-49h3-cwhj-4737GitHubgithub.com/cloudreve/cloudreve/security/advisories/GHSA-49h3-cwhj-4737

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55495?

CVE-2026-55495 is a medium-severity vulnerability. It was published on July 31, 2026 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-55495?

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-55495?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55495?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55495 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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