Vulnerability-Lookup

CVE-2026-21883 (GCVE-0-2026-21883)

Vulnerability from cvelistv5 – Published: 2026-01-08 01:20 – Updated: 2026-01-08 16:41

Title

Bokeh server applications have Incomplete Origin Validation in WebSockets

Summary

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.

Severity ?

4.5 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U

CWE

CWE-1385 - Missing Origin Validation in WebSockets

Assigner

GitHub_M

References

URL

Tags

	https://github.com/bokeh/bokeh/security/advisorie…	x_refsource_CONFIRM
	https://github.com/bokeh/bokeh/commit/cedd113b0e2…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	bokeh	bokeh	Affected: < 3.8.2

Show details on NVD website

JSON

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FKIE_CVE-2026-21883

Vulnerability from fkie_nvd - Published: 2026-01-08 02:15 - Updated: 2026-01-08 18:08

Severity ?

4.5 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/bokeh/bokeh/commit/cedd113b0e271b439dce768671685cf5f861812e
	security-advisories@github.com	https://github.com/bokeh/bokeh/security/advisories/GHSA-793v-589g-574v

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-21883",
  "lastModified": "2026-01-08T18:08:18.457",
  "metrics": {
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          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 4.5,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
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          "integrityRequirement": "NOT_DEFINED",
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          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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}

GHSA-793V-589G-574V

Vulnerability from github – Published: 2026-01-06 17:53 – Updated: 2026-01-08 20:11

Summary

Bokeh server applications have Incomplete Origin Validation in WebSockets

Details

This vulnerability allows for Cross-Site WebSocket Hijacking (CSWSH) of a deployed Bokeh server instance.

Scope

This vulnerability is only relevant to deployed Bokeh server instances. There is no impact on static HTML output, standalone embedded plots, or Jupyter notebook usage.

This vulnerability does not prevent any requirements for up-front authentication on Bokeh servers that have authentication hooks in place, and cannot be used to make Bokeh servers deployed on private, internal networks accessible outside those networks.

Impact

If a Bokeh 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.

Patches

Patched in versions 3.8.2 and later.

Workarounds

None

Technical description

The match_host function in src/bokeh/server/util.py contains a flaw in how it compares hostnames against the allowlist patterns. The function uses Python's zip() function to iterate over the parts of the hostname and the pattern simultaneously. However, zip() stops iteration when the shortest iterable is exhausted.

Because the code only checks if the pattern is longer than the host (lines 232-233), but fails to check if the host is longer than the pattern, a host that starts with the pattern (but has additional segments) will successfully match.

For example, if the allowlist is configured to ['[example.com](http://example.com/)'], the function will incorrectly validate [example.com.bad.com](http://example.com.evil.com/) as a match: 1. host parts: ['example', 'com', 'bad', 'com'] 2. pattern parts: ['example', 'com'] 3. zip compares example==example (OK) and com==com (OK). 4. Iteration stops, and the function returns True.

Severity ?

4.5 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "bokeh"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.8.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-21883"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1385"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-06T17:53:44Z",
    "nvd_published_at": "2026-01-08T02:15:53Z",
    "severity": "MODERATE"
  },
  "details": "This vulnerability allows for **Cross-Site WebSocket Hijacking (CSWSH)** of a deployed Bokeh server instance. \n\n### Scope\n\nThis vulnerability is only relevant to deployed Bokeh server instances. There is no impact on static HTML output, standalone embedded plots, or Jupyter notebook usage. \n\nThis vulnerability does not prevent any requirements for up-front authentication on Bokeh servers that have authentication hooks in place, and cannot be used to make Bokeh servers deployed on private, internal networks accessible outside those networks. \n\n### Impact\n\nIf a Bokeh 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.\n\nOnce connected, the attacker can interact with the Bokeh server on behalf of the victim, potentially accessing sensitive data, or modifying visualizations.\n\n### Patches\nPatched in versions 3.8.2 and later.\n\n### Workarounds\n\nNone\n\n### Technical description\n\nThe `match_host` function in `src/bokeh/server/util.py` contains a flaw in how it compares hostnames against the allowlist patterns. The function uses Python\u0027s `zip()` function to iterate over the parts of the hostname and the pattern simultaneously. However, `zip()` stops iteration when the shortest iterable is exhausted.\n\nBecause the code only checks if the *pattern* is longer than the *host* (lines 232-233), but fails to check if the *host* is longer than the *pattern*, a host that **starts** with the pattern (but has additional segments) will successfully match.\n\nFor example, if the allowlist is configured to `[\u0027[example.com](http://example.com/)\u0027]`, the function will incorrectly validate `[example.com.bad.com](http://example.com.evil.com/)` as a match:\n1. `host` parts: `[\u0027example\u0027, \u0027com\u0027, \u0027bad\u0027, \u0027com\u0027]`\n2. `pattern` parts: `[\u0027example\u0027, \u0027com\u0027]`\n3. `zip` compares `example==example` (OK) and `com==com` (OK).\n4. Iteration stops, and the function returns `True`.",
  "id": "GHSA-793v-589g-574v",
  "modified": "2026-01-08T20:11:40Z",
  "published": "2026-01-06T17:53:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/bokeh/bokeh/security/advisories/GHSA-793v-589g-574v"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21883"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bokeh/bokeh/commit/cedd113b0e271b439dce768671685cf5f861812e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/bokeh/bokeh"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Bokeh server applications have Incomplete Origin Validation in WebSockets"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-21883 (GCVE-0-2026-21883)

FKIE_CVE-2026-21883

GHSA-793V-589G-574V

Scope

Impact

Patches

Workarounds

Technical description

Tags

Sightings

Nomenclature