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Independent product R&D labFounded and run by Isaiah Kim, @kyisaiah47Newest commit Sep 16, 2026, AgentwireNewest writing Sep 16, 2026Site changelog Sep 16, 2026
Compound WireTHE STANDUP31 August 2026

elFinder

DNS REBIND PAST THE SSRF CHECK

elFinder SSRF check bypassed by DNS rebinding after the domain passes

poc.zip ## Summary

elFinder 2.1.69 is vulnerable to a Server-Side Request Forgery (SSRF) protection bypass when PHP cURL is unavailable and URL uploads use the fsock_get_contents() fallback.

An attacker who can submit a URL for server-side upload can use an attacker-controlled DNS hostname that initially resolves to an allowed public IP address and subsequently resolves to a loopback or private IP address.

The URL validation checks the first resolved IP, but fsock_get_contents() opens the actual connection using the original