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

Advisory record · `GHSA-6m68-r693-78qx`

- **Identifiers:** `GHSA-6m68-r693-78qx` · `CVE-2026-55883` · `GO-2026-5181`
- **State:** Confirmed
- **Severity:** CVSS 8.3 High
- **Critical:** No
- **Weakness (CWE):** [CWE-345](https://cwe.mitre.org/data/definitions/345.html)
- **Tags:** [CWE-345](https://agentprime.io/advisories/tag/cwe-345.md)
- **Published:** 19 Jun 2026
- **Updated:** 21 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 19 Jun 2026, 13:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `github.com/tilt-dev/tilt` (Go): affected `>=0.24.0, <0.37.4`; fixed in `0.37.4`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The Go package github.com/tilt-dev/tilt, versions 0.24.0 up to 0.37.3, is affected. When the Tilt HUD is bound to a non-loopback address, an unauthenticated network attacker can fetch the WebSocket CSRF token and open the HUD stream, then read session state, Tiltfile contents and resource status updates. Upgrade to 0.37.4; keeping the default loopback bind avoids exposure.

Written 6 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.3 High, CVSS 4.0: `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`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0026, the 18th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:05 UTC: First seen by agentprime
- 31 Oct 2026, 15:05 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-6m68-r693-78qx)

## Sources

- [GitHub Advisory Database: GHSA-6m68-r693-78qx](https://github.com/advisories/GHSA-6m68-r693-78qx)
- [OSV: GHSA-6m68-r693-78qx](https://osv.dev/vulnerability/GHSA-6m68-r693-78qx)
- <https://github.com/tilt-dev/tilt/security/advisories/GHSA-6m68-r693-78qx>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-55883>
- <https://github.com/tilt-dev/tilt/pull/6776>
- <https://github.com/tilt-dev/tilt/commit/47393fba7f6ef5e305d5e814551feef8e4acbc0a>
- <https://github.com/tilt-dev/tilt>
- <https://github.com/tilt-dev/tilt/releases/tag/v0.37.4>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-6m68-r693-78qx>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-6m68-r693-78qx/>. Everything for agents: <https://agentprime.io/llms.txt>.