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Description

Monsta FTP before 2.14.5 contains a server-side request forgery vulnerability in the fetchRemoteFile action caused by an incomplete IP blocklist check in the isBlockedIP() function, which fails to detect embedded IPv4 addresses within IPv4-mapped IPv6 addresses. An unauthenticated attacker can obtain a CSRF token from the public getSystemVars endpoint and submit a fetchRemoteFile request with a source URL resolving to an IPv4-mapped address, causing the server to issue HTTP requests to internal services and write responses to an attacker-controlled FTP destination, enabling retrieval of cloud instance metadata credentials.

PUBLISHED Reserved 2026-07-08 | Published 2026-07-08 | Updated 2026-07-08 | Assigner VulnCheck




HIGH: 7.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

HIGH: 8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Problem types

Server-Side Request Forgery (SSRF)

Product status

Default status
affected

Any version before 2.14.5
affected

Credits

Valentin Lobstein (Chocapikk) finder

VulnCheck finder

References

www.monstaftp.com/notes/ (Release Notes) release-notes patch

www.vulncheck.com/...srf-via-ipv4-mapped-ipv6-address-bypass third-party-advisory

cve.org (CVE-2026-60105)

nvd.nist.gov (CVE-2026-60105)

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