fix: add Origin check to WebSocket handler to prevent CSWSH#1364
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richard-to merged 1 commit intomainfrom Mar 15, 2026
Merged
fix: add Origin check to WebSocket handler to prevent CSWSH#1364richard-to merged 1 commit intomainfrom
richard-to merged 1 commit intomainfrom
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Browsers do not enforce same-origin policy for WebSocket upgrades, so a malicious page on a different origin could initiate a WebSocket connection to the Mesop server (cross-site WebSocket hijacking). This mirrors the existing CSRF check on the SSE endpoint. https://claude.ai/code/session_01JXV99vPFFRVeX3cst7SLTw
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Browsers do not enforce same-origin policy for WebSocket upgrades, so a malicious page on a different origin could initiate a WebSocket connection to the Mesop server (cross-site WebSocket hijacking). This mirrors the existing CSRF check on the SSE endpoint.
https://claude.ai/code/session_01JXV99vPFFRVeX3cst7SLTw