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CVE-2021-47899

4.0 · MEDIUM

YetiShare File Hosting Script 5.1.0 contains a server-side request forgery vulnerability that allows attackers to read local system files through the remote file upload feature.

Published Jan 23, 2026CWE-434EPSS 0.29%

Overview

CVE-2021-47899 is a medium-severity vulnerability. It was published on January 23, 2026 and has a CVSS 3.1 base score of 4.0 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.0, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

YetiShare File Hosting Script 5.1.0 contains a server-side request forgery vulnerability that allows attackers to read local system files through the remote file upload feature. Attackers can exploit the url parameter in the url_upload_handler endpoint to access sensitive files like /etc/passwd by using file:/// protocol.

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

Refmfscripts.comRefwww.exploit-db.com/exploits/49534Refwww.vulncheck.com/advisories/yetishare-file-hosting-script-remote-file-upload-ssrf-vulnerabilityRefyetishare.comRefwww.exploit-db.com/exploits/49534

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47899?

CVE-2021-47899 is a medium-severity vulnerability. It was published on January 23, 2026 and has a CVSS 3.1 base score of 4.0 (MEDIUM).

How severe is CVE-2021-47899?

This vulnerability has a CVSS 3.1 base score of 4.0, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47899?

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-2021-47899?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47899 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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