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CVE-2026-55883 is a high-severity cross-site WebSocket hijacking vulnerability in Tilt affecting versions 0.24.0 through 0.37.3. The Tilt HUD WebSocket endpoint is protected by a CSRF token, but the token can be retrieved from an unauthenticated API endpoint, and the WebSocket upgrader accepts clients that omit an Origin header. This combination defeats the intended authenticity checks for WebSocket access. When the Tilt HUD listener is exposed beyond loopback and reachable over the network, an unauthenticated attacker can establish a WebSocket connection to the HUD view stream and subscribe to the full stream of application state and updates. Exposed data can include session state, Tiltfile contents, resource status information, and ongoing HUD updates. The issue is fixed in Tilt 0.37.4.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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