Arbitrary file upload in Mfscripts Yetishare File Hosting Script
CVE-2021-47899
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.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Mfscripts Yetishare File Hosting Script — versions v5.1.0
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/49534 (exploit)
- mfscripts.com (product)
- yetishare.com (product)
- www.vulncheck.com/advisories/yetishare-file-hosting-script-remote-file-upload-s… (third-party-advisory)
Frequently asked questions
- What is CVE-2021-47899?
- CVE-2021-47899 is a medium-severity vulnerability in Mfscripts Yetishare File Hosting Script, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 4.0/10. Published 2026-01-23.
- How severe is CVE-2021-47899?
- Medium severity. CVSS v3 base score is 4.0 out of 10.