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Copying all inbound headers let a client inject Prerender control headers (e.g. X-Prerender-Url), turning the integration into an open proxy / SSRF on the account token. Mirror the CloudFlare worker fix: forward only user-agent/accept/accept-language and set the trusted X-Prerender-* headers. Applies to both the subscriber and custom-domain workers. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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What
Forward only an allowlist of request headers (
user-agent,accept,accept-language) toservice.prerender.ioin bothworker-subscriber.jsandworker-custom-domain.js, instead of copying every inbound header.Why
Copying all inbound headers let a client inject Prerender's own control headers — notably
X-Prerender-Url, which makes the service render an attacker-chosen URL on your token (open proxy / SSRF). Mirrors the CloudFlare worker fix.Scope
Only the prerender-service branches change. The reverse-proxy branch that forwards to the customer's own
LOVABLE_UPSTREAMis untouched.🤖 Generated with Claude Code