Cursor crossed the threshold from indie darling to enterprise procurement target sometime in late 2025, and the security questions followed within weeks. Does it index our code into a shared vector store? Where does the model run? What happens when an agent writes to a file it should not touch? Can we use our own key vault? The answers have changed materially with the 2026.02 release, and the security team conversations we are having today look very different from the ones we had a year ago.
This post walks through the current Cursor security model with the lens of a security engineer preparing a deployment approval. We focus on the three surfaces that matter most: code handling, agent execution, and integration with enterprise identity. We will also call out the gaps, because there are real ones.
How does Cursor handle source code?
Cursor handles source code through a tiered model with Privacy Mode, Privacy Mode with local indexing, and a standard mode that permits short-term retention for abuse prevention. In the enterprise SKU, Privacy Mode is the default and is enforced at the tenant level, meaning individual developers cannot disable it. Code sent to the model is not persisted, not used for training, and not accessible to Cursor staff.
The indexing pipeline is the part that trips most reviews. Cursor builds a vector index of the workspace to power retrieval during completions, and that index is either stored in Cursor's cloud or generated on the developer's machine. Enterprise deployments should enforce local indexing for repositories that contain regulated data, and they should configure the .cursorignore file at the organization level so that high-sensitivity paths, such as secrets/, infra/prod/, and anything matching internal classification globs, are excluded from indexing entirely.
What does the agent sandbox look like?
The agent sandbox is a per-workspace filesystem boundary with an optional command execution layer that runs inside a container on the developer's machine. File writes are constrained to the workspace root by default, and shell commands can be routed through a containerized shell that inherits only the environment variables the developer explicitly approves. The sandbox is not a hypervisor boundary, so a determined attacker with code execution could escape, but it is more than sufficient to prevent the accidental incidents that dominate the actual incident data.
The interesting failure mode is outside the sandbox. Cursor agents often call cloud tools, GitHub, Linear, Jira, through OAuth integrations. Those integrations are not sandboxed. An agent that is compromised through prompt injection can still file a PR, close a ticket, or assign work to a teammate. Enterprises should treat these integrations as separate trust boundaries and require human approval for any mutating action.
How does Cursor integrate with enterprise SSO and BYOK?
Cursor integrates with enterprise SSO through SAML and SCIM, and it supports bring-your-own-key for the underlying models. BYOK is the control that changes the risk conversation the most: when enabled, inference requests are routed directly to your Anthropic or OpenAI account, and the prompts and completions never touch Cursor's infrastructure except as metadata. Audit logs can be exported to your SIEM through the admin API.
The caveat is that some Cursor features still route through Cursor's infrastructure regardless of BYOK. The retrieval service, the tab completion backend, and the background indexing service all run in Cursor's cloud unless local indexing is enabled. Teams that need strict data residency should enable local indexing, disable the retrieval service for sensitive workspaces, and accept the modest quality trade-off that comes with it.
Where are the real gaps?
The real gaps are in extension handling, MCP server trust, and telemetry. Cursor supports VS Code extensions, and those extensions run with full access to the workspace. An extension with a compromised update pipeline can read every file the developer has open, and Cursor does not currently enforce a pre-approval workflow for extensions at the tenant level. Enterprises should ship an allowlist of approved extensions through MDM.
MCP server trust is the second gap. Cursor lets users add MCP servers with a few lines of config, and the servers run with the developer's credentials. We have seen developers add community MCP servers for Notion, Slack, or Postgres without any review. A compromised server is a direct path to the enterprise's most sensitive systems. Treat MCP server lists as a supply chain artifact, version them in a repo, and scan them like any other dependency.
Telemetry is the third. Cursor's product telemetry is reasonable by default, but it includes file names, language detection, and occasional code snippets for feature improvement unless telemetry is disabled at the tenant level. Review the telemetry toggle during onboarding.
How should security teams gate rollout?
Security teams should gate rollout with a three-phase plan: pilot under Privacy Mode with local indexing and BYOK, expand with a curated extension and MCP allowlist, and scale with SIEM integration and a policy gate on agent-produced changes. Each phase adds one new risk surface and validates it in production before moving on. The pilot phase alone takes about four weeks in a typical mid-market deployment, and it is where almost all of the configuration debt gets discovered.
How Safeguard Helps
Safeguard treats Cursor as a software supply chain input. We scan every MCP server and extension your developers add, run reachability analysis on their dependencies to confirm which CVEs are actually callable, and score the supplier risk for each through the TPRM module. Griffin AI reviews agent-produced pull requests for injection patterns and secret exposure before they merge, and SBOM generation tags every build with the full list of IDE-introduced components. Policy gates in CI block merges that pull in unapproved MCP servers or extensions. The net effect is that Cursor becomes an auditable part of your SDLC instead of an opaque black box.