Vulnerability · Published Jul 15, 2026 · Assigned by GitHub_M

CVE-2026-61613Cursor: Cloud Agent Browser Sandbox Escape

High 7.7

In plain English

A high-severity missing authentication in cursor from cursor. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).

Severity (CVSS 4.0)7.7High

Exploit odds (30 days)0.7%top 47.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
cursor	cursor	< 03/31/2026

Weakness: CWE-306 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

References

https://github.com/cursor/cursor/security/advisories/GHSA-whx2-4gvm-m3r3 x_refsource_CONFIRM