tilt-dev Tilt up to 0.37.3 WebSocket Upgrader /ws/view upgradeWebSocket Origin cross-site request forgery

Summaryinfo

A vulnerability classified as problematic was found in tilt-dev Tilt up to 0.37.3. This affects the function upgradeWebSocket of the file /ws/view of the component WebSocket Upgrader. Such manipulation of the argument Origin leads to cross-site request forgery. This vulnerability is referenced as CVE-2026-55883. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in tilt-dev Tilt up to 0.37.3. It has been rated as problematic. Affected by this issue is the function upgradeWebSocket of the file /ws/view of the component WebSocket Upgrader. The manipulation of the argument Origin with an unknown input leads to a cross-site request forgery vulnerability. Using CWE to declare the problem leads to CWE-352. The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. Impacted is integrity. CVE summarizes:

Tilt defines dev environments as code for microservice apps on Kubernetes. From 0.24.0 through 0.37.3, the Tilt HUD WebSocket at /ws/view is gated by a CSRF token, but the token is served by the unauthenticated /api/websocket_token endpoint and the upgrader accepts clients that omit an Origin header. When the HUD is network-exposed, an attacker who can reach the listener can open the HUD WebSocket and receive the full view stream, including session state, Tiltfile contents, resource statuses, and continued updates. This issue is fixed in version 0.37.4.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-55883 since 06/17/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 0.37.4 eliminates this vulnerability.

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Productinfo

Vendor

• tilt-dev

Name

• Tilt

Version

• 0.37.0
• 0.37.1
• 0.37.2
• 0.37.3

Website

• Product: https://github.com/tilt-dev/tilt/

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