What’s Vulnerable › Vulnerabilities

CVE-2026-60105: Monsta FTP < 2.14.5 SSRF via IPv4-Mapped IPv6 Address Bypass

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-08 · updated 2026-10-25
• Weakness: CWE-918

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.

Affected products

• Monsta Limited of New Zealand Monsta FTP: before 2.14.5 — fixed in 2.14.5

How to fix

Upgrade to a fixed version: Monsta Limited of New Zealand Monsta FTP 2.14.5. Check the vendor advisory for mitigations.

References

• https://www.monstaftp.com/notes/
• https://www.vulncheck.com/advisories/monsta-ftp-ssrf-via-ipv4-mapped-ipv6-address-bypass
• https://www.vulncheck.com/blog/monsta-ftp-ssrf-ipv6-blocklist-bypass

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