CVE-2026-61613 Cursor: Cloud Agent Browser Sandbox Escape
Attackers can execute code and access sensitive data in Cursor Cloud Agent sessions by exploiting an unauthenticated local endpoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-61613?
CVE-2026-61613 is a high-severity missing authorization vulnerability in cursor, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Cursor is a code editor built for programming with AI. Prior to the Cloud Agent fix on 03/31/2026, browser-enabled Cursor Cloud Agent sessions allowed attacker-controlled web content to connect from inside the agent container to an unauthenticated local agent endpoint, enabling code execution within the affected Cloud Agent sandbox or session and access to files, repository contents, environment variables, credentials, and GitHub App access tokens available to that session. This issue was fixed on 03/31/2026 by requiring authentication for the relevant agent endpoint.
Weakness: CWE-306
Which versions are affected by CVE-2026-61613?
How do I fix CVE-2026-61613?
No fix has been published for CVE-2026-61613 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-61613 being exploited?
There is no known exploitation of CVE-2026-61613 in the wild and no public exploit code.