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CVE-2026-61613 cursor CVE debrief

CVE-2026-61613 is a high-severity vulnerability in Cursor Cloud Agent that allows code execution. 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. The vulnerability was fixed on 03/31/2026 by requiring authentication for the relevant agent endpoint. Affected users should apply the fix to prevent code execution and review authentication for agent endpoints. This CVE record was published on 2026-07-15 and has not been modified since then. Users should verify their deployments and apply necessary patches.

Vendor
cursor
Product
Unknown
CVSS
HIGH 7.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-15
Original CVE updated
2026-07-21
Advisory published
2026-07-15
Advisory updated
2026-07-21

Who should care

Users of Cursor Cloud Agent, particularly those with browser-enabled Cursor Cloud Agent sessions, should apply the fix to prevent code execution and review authentication for agent endpoints. Affected operators and security teams should verify their deployments, review compensating controls, and monitor for suspicious activity.

Technical summary

CVE-2026-61613 is a high-severity vulnerability in Cursor Cloud Agent that allows code execution. 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. The vulnerability was fixed on 03/31/2026 by requiring authentication for the relevant agent endpoint.

Defensive priority

Apply the fix released on 03/31/2026, verify authentication for agent endpoints, monitor for suspicious activity, review compensating controls for exposed systems, check relevant monitoring, detection, and logs for exposed assets, track exceptions, and retest remediated assets.

Recommended defensive actions

  • Apply the fix released on 03/31/2026
  • Verify authentication for agent endpoints
  • Monitor for suspicious activity
  • Review compensating controls for exposed systems
  • Check relevant monitoring, detection, and logs for exposed assets
  • Track exceptions and retest remediated assets
  • Confirm whether affected product deployments exist in managed environments

Evidence notes

The CVE record was published on 2026-07-15T15:16:47.700Z and was last modified on 2026-07-21T15:16:38.030Z. The vulnerability affects Cursor Cloud Agent, allowing code execution prior to the fix on 03/31/2026. Evidence is limited to CVE and NVD details. Defenders should verify affected scope, review authentication for agent endpoints, and monitor for suspicious activity related to Cursor Cloud Agent sessions.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-15T15:16:47.700Z and has not been modified since then.