Monsta FTP < 2.14.5 SSRF via IPv4-Mapped IPv6 Address Bypass
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Monsta Limited of New Zealand | Monsta FTP | before 2.14.5 | 2.14.5 | Patch available | CNA |
- Monsta FTP VendorMonsta Limited of New Zealand Affected before 2.14.5 Fixed in 2.14.5 Patch available CNA
Remediation
- Fix · CNA Monsta FTP (Monsta Limited of New Zealand) Fixed in 2.14.5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-60105
- 2026-10-03 Alias added: GHSA-hf3x-9vx4-94qv
References
Patch 1
Sources
- CVE-2026-60105 · CVE Program
- CVE-2026-60105 · NVD
- FIRST EPSS
- GHSA-hf3x-9vx4-94qv · GitHub Advisory Database · CC BY 4.0
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