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That being said, having the ability to send HTTP requests to the internal servers is usually not critical vulnerability. Therefore having Clickhouse low-severity escaping vulnerability actually lead the whole chain to reach code execution. All the other services were requiring me to send special headers, which is not possible most of the SSRF cases :(

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I see what you're saying, but IMO the actual vulnerability there is that Clickhouse (by default?) was exposed fully unauthenticated and without any header requirement. Allowing completely unauthenticated access to Clickhouse, even read-only, means that they're just asking for issues like this.

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