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HackTheBox Fortress: Synacktiv — Full Writeup (v1 + v2)

Complete walkthrough of both Synacktiv HTB Fortress versions. v1 covers path traversal double-encoding, SSTI Jinja2 RCE, and PHP deserialization gadget chains. v2 covers GraphQL introspection abuse, XXE via SVG upload, and Node.js prototype pollution RCE.

lazyhackers
Mar 29, 2026 · 30 min read · 0 views
#CTF #Deserialization #Fortress #GraphQL #HackTheBox #Path Traversal #Prototype Pollution #RCE #SSTI #Synacktiv #Web Security #XXE
Synacktiv Fortress
HackTheBox
Linux Hard Fortress

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