CVE-2026-21883

Описание

Bokeh is an interactive visualization library written in Python. In versions 3.8.1 and below, if a server is configured with an allowlist (e.g., dashboard.corp), an attacker can register a domain like dashboard.corp.attacker.com (or use a subdomain if applicable) and lure a victim to visit it. The malicious site can then initiate a WebSocket connection to the vulnerable Bokeh server. Since the Origin header (e.g., http://dashboard.corp.attacker.com/) matches the allowlist according to the flawed logic, the connection is accepted. Once connected, the attacker can interact with the Bokeh server on behalf of the victim, potentially accessing sensitive data, or modifying visualizations. This issue is fixed in version 3.8.2.

A flaw was found in Bokeh, an interactive visualization library. A remote attacker could exploit flawed origin validation logic in WebSocket connections, which are used for real-time communication between a web browser and a server. By luring a victim to a malicious website, the attacker could bypass the server's security checks, establish a connection, and interact with the Bokeh server on the victim's behalf. This could lead to unauthorized access to sensitive data or modification of visualizations.