---
id: CVE-2026-54324
title: >-
  Daytona: Cross-tenant data leak in notification WebSocket gateway via
  unverified organizationId join
summary: >-
  Daytona: Cross-tenant data leak in notification WebSocket gateway via
  unverified organizationId join
severity: medium
cvss: 6.5
cwe:
  - CWE-639
  - CWE-863
vendor: daytonaio
product: github.com/daytonaio/daytona
ecosystem: go
affected:
  - github.com/daytonaio/daytona <= 0.184.0
patched:
  - github.com/daytonaio/daytona 0.185.0
published: '2026-06-17'
updated: '2026-06-17'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-qwxf-2m7m-2m3x'
references:
  - url: >-
      https://github.com/daytonaio/daytona/security/advisories/GHSA-qwxf-2m7m-2m3x
  - url: 'https://github.com/advisories/GHSA-qwxf-2m7m-2m3x'
tags:
  - ghsa
  - go
epss: 0.00456
epssPercentile: 0.36956
ingestedAt: '2026-06-29T14:31:47.227Z'
---

## Overview

### Summary
A cross-tenant authorization flaw in Daytona's notification WebSocket gateway allowed any authenticated user to subscribe to another organization's realtime notification channel and passively receive that organization's events.

### Impact
The notification gateway's JWT handshake joined a client-supplied organization identifier to the corresponding notification room without verifying that the authenticated user was a member of that organization. As a result, an authenticated user could receive another organization's realtime sandbox, snapshot, volume, and runner events, including data carried in those events. This is a cross-tenant confidentiality break. It required a valid account and knowledge of the target organization id (a non-secret UUID); no elevated privileges were needed. The API-key authentication path was not affected.

The affected component is the Daytona API service (the `apps/api` NestJS application). It is distributed through Daytona's repository releases and container images for self-hosted deployments; it is not published as a Go or npm package, so the advisory will not surface through `go get` or npm dependency tooling.

### Affected Versions
>= 0.101.0, <= 0.184.0

### Patched Versions
0.185.0

### Credit
@vnth4nhnt from CyStack

## Affected packages

- `github.com/daytonaio/daytona <= 0.184.0`

## Remediation

Upgrade to a patched release:

- `github.com/daytonaio/daytona 0.185.0`