Server-Side Request Forgery Vulnerability in YetiShare File Hosting Script by YetiShare
CVE-2021-47899

6.9MEDIUM

Key Information:

Vendor

Mfscripts

Status
Yetishare File Hosting Script
Vendor
CVE Published:
23 January 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47899?

YetiShare File Hosting Script version 5.1.0 is susceptible to a server-side request forgery (SSRF) vulnerability. This flaw enables attackers to exploit the url parameter within the url_upload_handler endpoint, allowing unauthorized access to sensitive local system files by utilizing the file:/// protocol. As a result, attackers can potentially retrieve critical information, including sensitive files such as /etc/passwd, posing serious security risks to affected installations.

Affected Version(s)

YetiShare File Hosting Script v5.1.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47899 - Proof of Concept

References

https://www.exploit-db.com/exploits/49534
exploit
https://mfscripts.com
product
https://yetishare.com
product

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Numan Türle
JSON
.