CVE-2026-21883 Vulnerability Analysis & Exploit Details

CVE-2026-21883
Vulnerability Scoring

5.4

/10

Significant Risk

Security assessments indicate that CVE-2026-21883 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Network
Vulnerability is exploitable over a network without physical access.
Privileges Required: None
No privileges are required for exploitation.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: Required
User interaction is necessary for successful exploitation.

CVE-2026-21883 Details

Status: Analyzed

Last updated: 🕑 09 Mar 2026, 14:00 UTC
Originally published on: 🕑 08 Jan 2026, 02:15 UTC

Time between publication and last update: 60 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVE-2026-21883 Vulnerability Summary

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.

Assessing the Risk of CVE-2026-21883

Access Complexity Graph

The exploitability of CVE-2026-21883 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-21883

With low attack complexity and no required privileges, CVE-2026-21883 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-21883, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-21883, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: Low
CVE-2026-21883 could lead to minor leaks of non-critical information without major privacy breaches.
Integrity: Low
Exploiting CVE-2026-21883 may cause minor changes to data without severely impacting its accuracy.
Availability: None
CVE-2026-21883 does not impact system availability.

CVE-2026-21883 References

External References

CWE Common Weakness Enumeration

CWE-1385

Vulnerable Configurations

cpe:2.3:a:bokeh:bokeh:0.1.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.1.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.2.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.2.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.3.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.3.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.4.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.4.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.4.1:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.4.1:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.4.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.4.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.4.3:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.4.3:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.4.4:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.4.4:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.5.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.5.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.5.1:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.5.1:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.5.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.5.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.6.0:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:0.7.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.7.0:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:0.7.1:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.8.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.8.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.8.1:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.8.1:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:0.8.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.9.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.9.0:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:0.9.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.9.3:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.9.3:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.10.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.10.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.11.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.11.0:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:0.12.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.0:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:0.12.1:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.3:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.3:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.4:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.4:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.5:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.5:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.6:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.6:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.7:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.7:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.9:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.9:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.10:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.10:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.11:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.11:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.12:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.12:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.13:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:0.12.16:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.12.16:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:0.13.0:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:1.0.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:1.0.0:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:1.0.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:1.0.2:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:1.2.0:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:2.0.2:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:2.2.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.2.1:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.2.1:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.2.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.2.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.2.3:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.2.3:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.3.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.3.0:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.3.1:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.3.1:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.3.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.3.2:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:2.3.3:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:3.0.0:*:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:3.4.3:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:3.4.3:*:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:3.5.0:-:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:3.5.0:-:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:3.5.0:dev2:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:3.5.0:dev3:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:3.5.0:dev3:*:*:*:python:*:*
cpe:2.3:a:bokeh:bokeh:3.5.0:dev4:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:3.5.0:dev5:*:*:*:python:*:*
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cpe:2.3:a:bokeh:bokeh:3.8.1:*:*:*:*:python:*:*

Protect Your Infrastructure against CVE-2026-21883: Combat Critical CVE Threats

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