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CVE-2025-61163 – Unauthenticated Cross-Origin WebSocket Access (CORS/Origin Bypass) – Cohere North A

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Summary

CVE-2025-61163 is a critical vulnerability in Cohere North AI v1.1.5 caused by an excessively permissive cross-domain policy on a WebSocket endpoint that fails to validate the incoming Origin header. The flaw allows any external, untrusted website to open a WebSocket connection to the affected instance and interact with internal APIs without authorization. It carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: the WebSocket server component does not validate the Origin header on incoming connection upgrade requests (CWE-942: Permissive Cross-domain Policy with Untrusted Domains).
  • Trigger condition: a victim with an active session simply needs to load an attacker-controlled web page; no user interaction beyond that is required.
  • Attack vector: Network — the attacker’s page establishes a cross-origin WebSocket connection (e.g., to a path such as /admin/api/_event/) and exchanges protocol messages to reach internal event/API functionality that should be restricted to trusted origins.
  • Impact: unauthorized access to internal real-time events and APIs, exposure of internal data flowing over the socket, and potential execution of unintended actions within the application — resulting in high impact to confidentiality, integrity, and availability.

Affected software

  • Cohere North AI, version 1.1.5

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade Cohere North AI beyond version 1.1.5 to a release that enforces server-side Origin validation on WebSocket connections; consult the vendor for the fixed build.
  • If no patch is available: restrict network exposure of the affected WebSocket/admin endpoints (e.g., place behind an authenticated reverse proxy or VPN), enforce strict Origin/Sec-WebSocket-Origin allow-listing at the load balancer or gateway, and monitor for unexpected cross-origin WebSocket connections to internal API paths.

References

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