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I. Basic Information for CVE-2026-21883
Vulnerability Information

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Vulnerability Title
Bokeh server applications have Incomplete Origin Validation in WebSockets
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1385
Source: NVD (National Vulnerability Database)
Vulnerability Title
bokeh 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
bokeh是Bokeh开源的一个数据可视化的Python库。 bokeh 3.8.1及之前版本存在安全漏洞,该漏洞源于允许列表配置不当,可能导致攻击者与Bokeh服务器交互。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
bokehbokeh < 3.8.2 -
II. Public POCs for CVE-2026-21883
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III. Intelligence Information for CVE-2026-21883
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