Weakness (CWE)
CWE-1385: Missing Origin Validation in WebSockets
The product uses a WebSocket, but it does not properly verify that the source of data or communication is valid.
How to prevent it (7 mitigations)
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Implementation
Enable CORS-like access restrictions by verifying the 'Origin' header during the WebSocket handshake.
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Implementation
Use a randomized CSRF token to verify requests.
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Implementation
Use TLS to securely communicate using 'wss' (WebSocket Secure) instead of 'ws'.
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Architecture and Design, Implementation
Require user authentication prior to the WebSocket connection being established. For example, the WS library in Node has a 'verifyClient' function.
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Implementation
Leverage rate limiting to prevent against DoS. Use of the leaky bucket algorithm can help with this.
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Implementation
Use a library that provides restriction of the payload size. For example, WS library for Node includes 'maxPayloadoption' that can be set.
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Implementation
Treat data/input as untrusted in both directions and apply the same data/input sanitization as XSS, SQLi, etc.
Source: MITRE CWE-1385
19 results · Clear filters · Feed
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High 7.2
Cross-Site WebSocket Hijacking and Permissive CORS in Google Agent Development Kit (ADK) for Java Development Server
Missing Origin Validation in WebSockets (CWE-1385) and Permissive Cross-domain Policy with Untrusted Domains (CWE-942) in the development web server (ADK Web) in Google Agent Development Kit (ADK) for Java (com.google.adk:google-adk-dev versions 0.1.0 before …
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High 8.2
webpack-dev-server vulnerable to cross-origin WebSocket access via proxied upgrades
webpack-dev-server is a development server that provides live reloading for webpack projects. In versions before 5.2.7 and in version 6.0.0, when a proxy entry is configured to forward WebSockets, the server forwards non-HMR WebSocket upgrade requests to the …
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High 8.7
Cross-Site WebSocket Hijacking in Google Cloud Shell
A Cross-Site WebSocket Hijacking vulnerability in Cloud Shell prior to 2026-07-22 on Google Cloud Platform allows an unauthenticated attacker to hijack an active Cloud Shell session and exfiltrate the user's OAuth access token using a cross-origin WebSocket r…
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High 8.8
obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access
obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults. Prior to 1.3.1, the Streamable HTTP transport does not validate the Host or Origin header or enable DNS-rebinding protection. When the documented loopback configuration …
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High 8.8
Headroom vulnerable to Cross-Site WebSocket Hijacking (CSWSH)
Headroom compresses data before the data reaches a large language model. Prior to version 0.35.0, the Headroom WebSocket server does not validate the `Origin` header of incoming client WebSocket requests before forwarding the request to the upstream server, a…
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High 7.6
MCP Python SDK: WebSocket server transport does not support Host/Origin validation
The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to 1.28.1, the deprecated mcp.server.websocket.websocket_server transport accepted WebSocket handshakes without applying Host or Origin header valida…
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High 7.5
Apache Helix REST: Permissive CORS Configuration in REST API Allows Unrestricted Cross-Origin
Permissive Cross-Origin Resource Sharing (CORS) in the REST API (helix-rest, org.apache.helix.rest.server.filters.CORSFilter) in Apache Helix through 2.0.0 on all platforms allows a remote attacker controlling a web page visited by an authorized user to read …
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High 8.8
In affected versions of Eclipse Theia (1.8.1 and later), the browser backend exposes privileged terminal RPC over WebSo…
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High 8.0
nanobot: Cross-Site WebSocket Hijacking in WhatsApp Bridge (CVE-2026-2577 Fix Update)
nanobot is a personal AI assistant. Versions prior to 0.1.5 contain a Cross-Site WebSocket Hijacking (CSWSH) vulnerability exists in the bridge's WebSocket server in bridge/src/server.ts, resulting from an incomplete remediation of CVE-2026-2577. The original…
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High 8.9
Storybook Dev Server Vulnerable to WebSocket Hijacking
Storybook is a frontend workshop for building user interface components and pages in isolation. Prior to versions 7.6.23, 8.6.17, 9.1.19, and 10.2.10, the WebSocket functionality in Storybook's dev server, used to create and update stories, is vulnerable to W…
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High 7.1CVE-2025-68930 Public exploit
Traccar Missing Origin Validation in WebSockets
Versions of the Traccar open-source GPS tracking system up to and including 6.11.1 contain a Cross-Site WebSocket Hijacking (CSWSH) vulnerability in the `/api/socket` endpoint. The application fails to validate the `Origin` header during the WebSocket handsha…
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High 7.4
Privilege Escalation via WebSocket Connection Hijacking in LXD Operations API
Privilege Escalation in operations API in Canonical LXD <6.5 on multiple platforms allows attacker with read permissions to hijack terminal or console sessions and execute arbitrary commands via WebSocket connection hijacking format
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High 8.6
Komari Allows Cross-site WebSocket Hijacking
Komari is a lightweight, self-hosted server monitoring tool designed to provide a simple and efficient solution for monitoring server performance. Prior to 1.0.4-fix1, WebSocket upgrader has disabled origin checking, enabling Cross-Site WebSocket Hijacking (C…
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High 7.5
Apache Zeppelin: Command Injection via CSWSH
Missing Origin Validation in WebSockets vulnerability in Apache Zeppelin. The attacker could access the Zeppelin server from another origin without any restriction, and get internal information about paragraphs. This issue affects Apache Zeppelin: from 0.11.…
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High 8.8
Claude Code IDE extensions allow websocket connections from arbitrary origins
Claude Code is an agentic coding tool. Claude Code extensions in VSCode and forks (e.g., Cursor, Windsurf, and VSCodium) and JetBrains IDEs (e.g., IntelliJ, Pycharm, and Android Studio) are vulnerable to unauthorized websocket connections from an attacker whe…
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High 8.0
Movim prior to version 0.22 is affected by a Cross-Site WebSocket Hijacking vulnerability. This was the result of a mis…
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High 8.3CVE-2023-30856 Public exploit
eDEX-UI cross-site websocket hijacking vulnerability enables remote command execution
eDEX-UI is a science fiction terminal emulator. Versions 2.2.8 and prior are vulnerable to cross-site websocket hijacking. When running eDEX-UI and browsing the web, a malicious website can connect to eDEX's internal terminal control websocket, and send arbit…
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High 8.2
code-server vulnerable to Missing Origin Validation in WebSockets
Versions of the package code-server before 4.10.1 are vulnerable to Missing Origin Validation in WebSockets handshakes. Exploiting this vulnerability can allow an adversary in specific scenarios to access data from and connect to the code-server instance.
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High 8.2
An issue was discovered in Gitpod versions prior to release-2022.11.2.16. There is a Cross-Site WebSocket Hijacking (CS…