CVE-2026-55883CWE-345

Tilt: Cross-site WebSocket hijacking of the Tilt HUD stream

High · published July 10, 2026

CVSS v4.0
8.3
EPSS
0%
Percentile
17.1
In the wild
Unconfirmed
What it is

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 record
Technical detail
CVSS v4.0
8.3 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00262 · 17.1th percentile
Weakness
CWE-345 · Insufficient Verification of Data Authenticity
Published
2026-07-10T21:38Z
EPSS history
Timeline
  • 10 JUL 21:38Z
    Tilt: Cross-site WebSocket hijacking of the Tilt HUD stream
    cvelistv5