Vulnerability Details CVE-2026-21883
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 0.8%
CVSS Severity
CVSS v3 Score 5.4
References
Products affected by CVE-2026-21883
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cpe:2.3:a:bokeh:bokeh:0.1.0
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cpe:2.3:a:bokeh:bokeh:0.10.0
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cpe:2.3:a:bokeh:bokeh:0.11.0
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cpe:2.3:a:bokeh:bokeh:0.11.1
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cpe:2.3:a:bokeh:bokeh:0.12.0
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cpe:2.3:a:bokeh:bokeh:0.12.1
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cpe:2.3:a:bokeh:bokeh:0.12.10
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cpe:2.3:a:bokeh:bokeh:0.12.11
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cpe:2.3:a:bokeh:bokeh:0.12.12
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cpe:2.3:a:bokeh:bokeh:0.12.13
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cpe:2.3:a:bokeh:bokeh:0.12.14
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cpe:2.3:a:bokeh:bokeh:0.12.15
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cpe:2.3:a:bokeh:bokeh:0.12.16
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cpe:2.3:a:bokeh:bokeh:0.12.2
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cpe:2.3:a:bokeh:bokeh:0.12.3
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cpe:2.3:a:bokeh:bokeh:0.12.4
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cpe:2.3:a:bokeh:bokeh:0.12.5
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cpe:2.3:a:bokeh:bokeh:0.12.6
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cpe:2.3:a:bokeh:bokeh:0.12.7
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cpe:2.3:a:bokeh:bokeh:0.12.9
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cpe:2.3:a:bokeh:bokeh:0.13.0
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cpe:2.3:a:bokeh:bokeh:0.2.0
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cpe:2.3:a:bokeh:bokeh:0.3.0
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cpe:2.3:a:bokeh:bokeh:0.4.0
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cpe:2.3:a:bokeh:bokeh:0.4.1
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cpe:2.3:a:bokeh:bokeh:0.4.2
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cpe:2.3:a:bokeh:bokeh:0.4.3
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cpe:2.3:a:bokeh:bokeh:0.4.4
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cpe:2.3:a:bokeh:bokeh:0.5.0
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cpe:2.3:a:bokeh:bokeh:0.5.1
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cpe:2.3:a:bokeh:bokeh:0.5.2
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cpe:2.3:a:bokeh:bokeh:0.6.0
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cpe:2.3:a:bokeh:bokeh:0.6.1
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cpe:2.3:a:bokeh:bokeh:0.7.0
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cpe:2.3:a:bokeh:bokeh:0.7.1
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cpe:2.3:a:bokeh:bokeh:0.8.0
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cpe:2.3:a:bokeh:bokeh:0.8.1
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cpe:2.3:a:bokeh:bokeh:0.8.2
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cpe:2.3:a:bokeh:bokeh:0.9.0
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cpe:2.3:a:bokeh:bokeh:0.9.1
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cpe:2.3:a:bokeh:bokeh:0.9.2
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cpe:2.3:a:bokeh:bokeh:0.9.3
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cpe:2.3:a:bokeh:bokeh:1.0.0
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cpe:2.3:a:bokeh:bokeh:1.0.1
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cpe:2.3:a:bokeh:bokeh:1.0.2
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cpe:2.3:a:bokeh:bokeh:1.0.3
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cpe:2.3:a:bokeh:bokeh:1.0.4
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cpe:2.3:a:bokeh:bokeh:1.1.0
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cpe:2.3:a:bokeh:bokeh:1.2.0
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cpe:2.3:a:bokeh:bokeh:1.3.0
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cpe:2.3:a:bokeh:bokeh:1.3.1
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cpe:2.3:a:bokeh:bokeh:1.3.2
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cpe:2.3:a:bokeh:bokeh:1.3.4
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cpe:2.3:a:bokeh:bokeh:1.4.0
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cpe:2.3:a:bokeh:bokeh:2.0.0
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cpe:2.3:a:bokeh:bokeh:2.0.1
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cpe:2.3:a:bokeh:bokeh:2.0.2
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cpe:2.3:a:bokeh:bokeh:2.1.0
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cpe:2.3:a:bokeh:bokeh:2.1.1
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cpe:2.3:a:bokeh:bokeh:2.2.0
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cpe:2.3:a:bokeh:bokeh:2.2.1
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cpe:2.3:a:bokeh:bokeh:2.2.2
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cpe:2.3:a:bokeh:bokeh:2.2.3
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cpe:2.3:a:bokeh:bokeh:2.3.0
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cpe:2.3:a:bokeh:bokeh:2.3.1
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cpe:2.3:a:bokeh:bokeh:2.3.2
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cpe:2.3:a:bokeh:bokeh:2.3.3
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cpe:2.3:a:bokeh:bokeh:2.4.0
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cpe:2.3:a:bokeh:bokeh:2.4.1
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cpe:2.3:a:bokeh:bokeh:2.4.2
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cpe:2.3:a:bokeh:bokeh:2.4.3
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cpe:2.3:a:bokeh:bokeh:3.0.0
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cpe:2.3:a:bokeh:bokeh:3.0.1
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cpe:2.3:a:bokeh:bokeh:3.0.2
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cpe:2.3:a:bokeh:bokeh:3.0.3
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cpe:2.3:a:bokeh:bokeh:3.1.0
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cpe:2.3:a:bokeh:bokeh:3.1.1
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cpe:2.3:a:bokeh:bokeh:3.2.0
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cpe:2.3:a:bokeh:bokeh:3.2.1
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cpe:2.3:a:bokeh:bokeh:3.2.2
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cpe:2.3:a:bokeh:bokeh:3.3.0
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cpe:2.3:a:bokeh:bokeh:3.3.1
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cpe:2.3:a:bokeh:bokeh:3.3.2
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cpe:2.3:a:bokeh:bokeh:3.3.3
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cpe:2.3:a:bokeh:bokeh:3.3.4
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cpe:2.3:a:bokeh:bokeh:3.4.0
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cpe:2.3:a:bokeh:bokeh:3.4.1
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cpe:2.3:a:bokeh:bokeh:3.4.2
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cpe:2.3:a:bokeh:bokeh:3.4.3
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cpe:2.3:a:bokeh:bokeh:3.5.0
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cpe:2.3:a:bokeh:bokeh:3.5.1
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cpe:2.3:a:bokeh:bokeh:3.5.2
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cpe:2.3:a:bokeh:bokeh:3.6.0
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cpe:2.3:a:bokeh:bokeh:3.6.1
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cpe:2.3:a:bokeh:bokeh:3.6.2
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cpe:2.3:a:bokeh:bokeh:3.6.3
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cpe:2.3:a:bokeh:bokeh:3.7.0
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cpe:2.3:a:bokeh:bokeh:3.7.1
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cpe:2.3:a:bokeh:bokeh:3.7.2
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cpe:2.3:a:bokeh:bokeh:3.7.3
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cpe:2.3:a:bokeh:bokeh:3.8.0
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cpe:2.3:a:bokeh:bokeh:3.8.1