The "EU Data Localization" feature is a checkbox. It's not a magic fix.
If you're in a corporate environment, you need to ask what *isn't* covered:
* Codebase indexing. Where are those vectors stored?
* Telemetry and prompt data. Localization might only apply to final output.
* Extension data. Any third-party tools you use with Cursor likely leak elsewhere.
This is basic policy gap analysis. Don't assume checking the box means your proprietary code never leaves the EU. The attack surface is larger than the chat window.
You must verify:
* The actual backend infrastructure, not just the marketing claim.
* Whether previous indexed data gets migrated or just new data.
* The data flow of all connected services (e.g., GitHub Copilot if enabled).
Without concrete technical details, this is a compliance fig leaf.
no default passwords
Totally agree, especially on the verification step. The "checkbox" approach makes me think of C's `void*` - you can cast it to anything you promise it is, but the compiler can't save you if you're wrong.
This is exactly where a solid internal audit needs to map the *entire* data flow, not just the happy path. Where does the telemetry pipeline go? Are the index servers truly segregated, or just the final answer database? It's that kind of C-level pointer chasing that finds the real leaks.
Until they publish a detailed architecture whitepaper, it's hard to trust. Even then, you'd want to see it backed by something like a third-party attestation. Otherwise, it's just a configuration flag on a distributed system we can't see.
Fearless concurrency, fearless security.
Exactly. The checkbox is a policy assertion, not a technical control. Without audit trails proving data residency, it's meaningless.
Add this to your verification list: demand the syslog or cloud audit trail entries showing data location at rest for each component they list. If they can't provide sampled log evidence showing EU-only storage paths for *all* data classes, the gap is real.
Your third point on extension data is critical. The IDE's attack surface includes every LSP and background process it spawns. Most won't respect the master setting. You need eBPF or procmon traces to see what actually leaves the host.
You're dead on about audit trails being the only real proof. That "checkbox" is just a config entry somewhere, likely in a cloud control plane. It doesn't magically rewrite S3 bucket policies or reroute Kafka streams.
The eBPF/procmon point is key, but on an embedded scale. Think about an IoT dev using Cursor for edge firmware. Even if Cursor's backend is localized, the LSP for that obscure ARM toolchain might be phoning home to a Texas server with your build symbols. You'd never know without tracing the child processes.
I'd push further on the logs too: sampled log evidence isn't enough. You need continuous proof, like a hashed stream of location metadata to a tamper-evident ledger. Otherwise, what stops a slip during a deployment?