What is CVE-2026-50549?
Cursor is a code editor built for programming with AI. Prior to 3.0, Cursor runs agent terminal commands in a sandbox by default. Before a Write, the agent canonicalizes the target path to confirm it stays inside the workspace, but when canonicalization fails it falls back to the original path and writes without approval. A malicious agent can create an in-workspace symlink that points outside the workspace and force canonicalization to fail — either because the target does not exist or because read permission is removed from the path — so the agent writes through the symlink to an arbitrary location without approval. A malicious agent could write arbitrary files outside the workspace under the user's privileges. This enables non-sandboxed Remote Code Execution — for example by overwriting the cursorsandbox helper so later commands run unsandboxed — with no user interaction beyond a benign prompt. This vulnerability is fixed in 3.0.
Timeline
- 2026-06-25Published to the U.S. National Vulnerability Database (NVD)
- 2026-06-26NVD record last updated
Affected product
Anysphere Cursor
Remediation Steps
- Update Cursor to the latest patched version
- Disable or restrict execution of untrusted code snippets and prompts
- Review Cursor's sandbox configuration and security settings
- Educate users on risks of prompt injection attacks
References
Referenced in our briefings & reports
- Vulnerability Priority Report – Week 5 of June 2026 (June 29 – July 5)
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