Simon Willison • 12/18/2025

Inside PostHog: How SSRF, a ClickHouse SQL Escaping 0day, and Default PostgreSQL Credentials Formed an RCE Chain

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A detailed breakdown of a sophisticated Remote Code Execution (RCE) vulnerability chain discovered in the PostHog analytics platform. The attack combined a Server-Side Request Forgery (SSRF) via webhooks, a zero-day SQL escaping bug in ClickHouse's PostgreSQL function, and default database credentials to execute shell commands on an internal PostgreSQL server, ultimately enabling a reverse shell.

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#postgresql #sql injection #Clickhouse
Inside PostHog: How SSRF, a ClickHouse SQL Escaping 0day, and Default PostgreSQL Credentials Formed an RCE Chain

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