CVE-2021-47899Public exploitNetwork attack vector

Local file disclosure via unvalidated remote upload URL

Published Jan 23, 2026 · Updated Jan 23, 2026

SSRF in MFScripts YetiShare File Hosting Script 5.1.0 allows remote attackers to read local files through the remote upload endpoint. The url_upload_handler flow passes the unvalidated url value through handleRemoteUrlUpload to cURL, which accepts file-scheme paths. An internet-reachable remote upload feature and a request session expose files readable by the PHP process; the demonstrated request retrieves /etc/passwd.

CVSS severity6.9
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in MFScripts YetiShare File Hosting Script 5.1.0 allows remote attackers to read local files through the remote upload endpoint. The url_upload_handler flow passes the unvalidated url value through handleRemoteUrlUpload to cURL, which accepts file-scheme paths. An internet-reachable remote upload feature and a request session expose files readable by the PHP process; the demonstrated request retrieves /etc/passwd.

The record

CVE
CVE-2021-47899
Published
Jan 23, 2026
Updated
Jan 23, 2026
Vendor
MFScripts
Product
YetiShare File Hosting Script
Classifications
CWE-434, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=v5.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MFScripts · YetiShare File Hosting Scriptversion=v5.1.0

Published CVSS scores

6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
4.0VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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