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CVE-2026-61613

Cursor: Cloud Agent Browser Sandbox Escape

HIGH
7.7
CVSS Score
Published: July 15, 2026 at 02:18 PM UTC
Updated: July 21, 2026 at 03:16 PM UTC
1 product affected across 1 vendorCursor

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Severity
HIGH7.7
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cursor· Cursor
60%
v < 3
Affected range stops below 3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.7HIGHGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-306

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