$ cat writeup.md…
$ cat writeup.md…
hackadvisor
Task: Webhook management platform with URL validation blocking internal IPv4 addresses (SSRF filter). Solution: Bypass the blocklist using IPv6-mapped IPv4 address [::ffff:127.0.0.1] to reach an internal metadata service on port 3001 and exfiltrate secrets via webhook delivery logs.
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$sign in$ grep --similar