CVEDB API

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-44727

Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in jupyter_server render user-authored notebook HTML under the Jupyter origin without a sandbox directive in their Content-Security-Policy. Combined with nbconvert.HTMLExporter's default non-sanitizing behavior, a notebook carrying an HTML payload in a display_data output triggers stored XSS with cookie access, full /api/* authority, and kernel RCE. This vulnerability is fixed in 2.20.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.001

EPSS Ranking 3.5%

CVSS Severity

CVSS v3 Score 5.4

References

Products affected by CVE-2026-44727

Jupyter » Jupyter Server » Version: N/A

cpe:2.3:a:jupyter:jupyter_server:-
Jupyter » Jupyter Server » Version: 0.0.1

cpe:2.3:a:jupyter:jupyter_server:0.0.1
Jupyter » Jupyter Server » Version: 0.0.2

cpe:2.3:a:jupyter:jupyter_server:0.0.2
Jupyter » Jupyter Server » Version: 0.0.3

cpe:2.3:a:jupyter:jupyter_server:0.0.3
Jupyter » Jupyter Server » Version: 0.0.4

cpe:2.3:a:jupyter:jupyter_server:0.0.4
Jupyter » Jupyter Server » Version: 0.0.5

cpe:2.3:a:jupyter:jupyter_server:0.0.5
Jupyter » Jupyter Server » Version: 0.1.0

cpe:2.3:a:jupyter:jupyter_server:0.1.0
Jupyter » Jupyter Server » Version: 0.1.1

cpe:2.3:a:jupyter:jupyter_server:0.1.1
Jupyter » Jupyter Server » Version: 0.2.0

cpe:2.3:a:jupyter:jupyter_server:0.2.0
Jupyter » Jupyter Server » Version: 0.2.1

cpe:2.3:a:jupyter:jupyter_server:0.2.1
Jupyter » Jupyter Server » Version: 0.3.0

cpe:2.3:a:jupyter:jupyter_server:0.3.0
Jupyter » Jupyter Server » Version: 1.0.0

cpe:2.3:a:jupyter:jupyter_server:1.0.0
Jupyter » Jupyter Server » Version: 1.0.1

cpe:2.3:a:jupyter:jupyter_server:1.0.1
Jupyter » Jupyter Server » Version: 1.0.2

cpe:2.3:a:jupyter:jupyter_server:1.0.2
Jupyter » Jupyter Server » Version: 1.0.3

cpe:2.3:a:jupyter:jupyter_server:1.0.3
Jupyter » Jupyter Server » Version: 1.0.4

cpe:2.3:a:jupyter:jupyter_server:1.0.4
Jupyter » Jupyter Server » Version: 1.0.5

cpe:2.3:a:jupyter:jupyter_server:1.0.5
Jupyter » Jupyter Server » Version: 1.0.6

cpe:2.3:a:jupyter:jupyter_server:1.0.6
Jupyter » Jupyter Server » Version: 1.0.7

cpe:2.3:a:jupyter:jupyter_server:1.0.7
Jupyter » Jupyter Server » Version: 1.1.1

cpe:2.3:a:jupyter:jupyter_server:1.1.1
Jupyter » Jupyter Server » Version: 1.10.0

cpe:2.3:a:jupyter:jupyter_server:1.10.0
Jupyter » Jupyter Server » Version: 1.10.1

cpe:2.3:a:jupyter:jupyter_server:1.10.1
Jupyter » Jupyter Server » Version: 1.10.2

cpe:2.3:a:jupyter:jupyter_server:1.10.2
Jupyter » Jupyter Server » Version: 1.11.0

cpe:2.3:a:jupyter:jupyter_server:1.11.0
Jupyter » Jupyter Server » Version: 1.11.1

cpe:2.3:a:jupyter:jupyter_server:1.11.1
Jupyter » Jupyter Server » Version: 1.11.2

cpe:2.3:a:jupyter:jupyter_server:1.11.2
Jupyter » Jupyter Server » Version: 1.12.0

cpe:2.3:a:jupyter:jupyter_server:1.12.0
Jupyter » Jupyter Server » Version: 1.12.1

cpe:2.3:a:jupyter:jupyter_server:1.12.1
Jupyter » Jupyter Server » Version: 1.13.0

cpe:2.3:a:jupyter:jupyter_server:1.13.0
Jupyter » Jupyter Server » Version: 1.13.1

cpe:2.3:a:jupyter:jupyter_server:1.13.1
Jupyter » Jupyter Server » Version: 1.13.2

cpe:2.3:a:jupyter:jupyter_server:1.13.2
Jupyter » Jupyter Server » Version: 1.13.3

cpe:2.3:a:jupyter:jupyter_server:1.13.3
Jupyter » Jupyter Server » Version: 1.13.4

cpe:2.3:a:jupyter:jupyter_server:1.13.4
Jupyter » Jupyter Server » Version: 1.13.5

cpe:2.3:a:jupyter:jupyter_server:1.13.5
Jupyter » Jupyter Server » Version: 1.15.0

cpe:2.3:a:jupyter:jupyter_server:1.15.0
Jupyter » Jupyter Server » Version: 1.15.1

cpe:2.3:a:jupyter:jupyter_server:1.15.1
Jupyter » Jupyter Server » Version: 1.15.2

cpe:2.3:a:jupyter:jupyter_server:1.15.2
Jupyter » Jupyter Server » Version: 1.15.3

cpe:2.3:a:jupyter:jupyter_server:1.15.3
Jupyter » Jupyter Server » Version: 1.15.4

cpe:2.3:a:jupyter:jupyter_server:1.15.4
Jupyter » Jupyter Server » Version: 1.15.5

cpe:2.3:a:jupyter:jupyter_server:1.15.5
Jupyter » Jupyter Server » Version: 1.15.6

cpe:2.3:a:jupyter:jupyter_server:1.15.6
Jupyter » Jupyter Server » Version: 1.16.0

cpe:2.3:a:jupyter:jupyter_server:1.16.0
Jupyter » Jupyter Server » Version: 1.17.0

cpe:2.3:a:jupyter:jupyter_server:1.17.0
Jupyter » Jupyter Server » Version: 1.17.1

cpe:2.3:a:jupyter:jupyter_server:1.17.1
Jupyter » Jupyter Server » Version: 1.18.0

cpe:2.3:a:jupyter:jupyter_server:1.18.0
Jupyter » Jupyter Server » Version: 1.18.1

cpe:2.3:a:jupyter:jupyter_server:1.18.1
Jupyter » Jupyter Server » Version: 1.19.0

cpe:2.3:a:jupyter:jupyter_server:1.19.0
Jupyter » Jupyter Server » Version: 1.19.1

cpe:2.3:a:jupyter:jupyter_server:1.19.1
Jupyter » Jupyter Server » Version: 1.21.0

cpe:2.3:a:jupyter:jupyter_server:1.21.0
Jupyter » Jupyter Server » Version: 1.23.0

cpe:2.3:a:jupyter:jupyter_server:1.23.0
Jupyter » Jupyter Server » Version: 1.23.1

cpe:2.3:a:jupyter:jupyter_server:1.23.1
Jupyter » Jupyter Server » Version: 1.23.2

cpe:2.3:a:jupyter:jupyter_server:1.23.2
Jupyter » Jupyter Server » Version: 1.23.3

cpe:2.3:a:jupyter:jupyter_server:1.23.3
Jupyter » Jupyter Server » Version: 1.23.4

cpe:2.3:a:jupyter:jupyter_server:1.23.4
Jupyter » Jupyter Server » Version: 1.23.5

cpe:2.3:a:jupyter:jupyter_server:1.23.5
Jupyter » Jupyter Server » Version: 1.23.6

cpe:2.3:a:jupyter:jupyter_server:1.23.6
Jupyter » Jupyter Server » Version: 1.24.0

cpe:2.3:a:jupyter:jupyter_server:1.24.0
Jupyter » Jupyter Server » Version: 1.6.2

cpe:2.3:a:jupyter:jupyter_server:1.6.2
Jupyter » Jupyter Server » Version: 1.6.3

cpe:2.3:a:jupyter:jupyter_server:1.6.3
Jupyter » Jupyter Server » Version: 1.6.4

cpe:2.3:a:jupyter:jupyter_server:1.6.4
Jupyter » Jupyter Server » Version: 1.7.0

cpe:2.3:a:jupyter:jupyter_server:1.7.0
Jupyter » Jupyter Server » Version: 1.8.0

cpe:2.3:a:jupyter:jupyter_server:1.8.0
Jupyter » Jupyter Server » Version: 1.9.0

cpe:2.3:a:jupyter:jupyter_server:1.9.0
Jupyter » Jupyter Server » Version: 2.0.0

cpe:2.3:a:jupyter:jupyter_server:2.0.0
Jupyter » Jupyter Server » Version: 2.0.1

cpe:2.3:a:jupyter:jupyter_server:2.0.1
Jupyter » Jupyter Server » Version: 2.0.2

cpe:2.3:a:jupyter:jupyter_server:2.0.2
Jupyter » Jupyter Server » Version: 2.0.3

cpe:2.3:a:jupyter:jupyter_server:2.0.3
Jupyter » Jupyter Server » Version: 2.0.4

cpe:2.3:a:jupyter:jupyter_server:2.0.4
Jupyter » Jupyter Server » Version: 2.0.5

cpe:2.3:a:jupyter:jupyter_server:2.0.5
Jupyter » Jupyter Server » Version: 2.0.6

cpe:2.3:a:jupyter:jupyter_server:2.0.6
Jupyter » Jupyter Server » Version: 2.0.7

cpe:2.3:a:jupyter:jupyter_server:2.0.7
Jupyter » Jupyter Server » Version: 2.1.0

cpe:2.3:a:jupyter:jupyter_server:2.1.0
Jupyter » Jupyter Server » Version: 2.10.0

cpe:2.3:a:jupyter:jupyter_server:2.10.0
Jupyter » Jupyter Server » Version: 2.10.1

cpe:2.3:a:jupyter:jupyter_server:2.10.1
Jupyter » Jupyter Server » Version: 2.11.0

cpe:2.3:a:jupyter:jupyter_server:2.11.0
Jupyter » Jupyter Server » Version: 2.11.1

cpe:2.3:a:jupyter:jupyter_server:2.11.1
Jupyter » Jupyter Server » Version: 2.11.2

cpe:2.3:a:jupyter:jupyter_server:2.11.2
Jupyter » Jupyter Server » Version: 2.12.0

cpe:2.3:a:jupyter:jupyter_server:2.12.0
Jupyter » Jupyter Server » Version: 2.12.1

cpe:2.3:a:jupyter:jupyter_server:2.12.1
Jupyter » Jupyter Server » Version: 2.12.2

cpe:2.3:a:jupyter:jupyter_server:2.12.2
Jupyter » Jupyter Server » Version: 2.12.3

cpe:2.3:a:jupyter:jupyter_server:2.12.3
Jupyter » Jupyter Server » Version: 2.12.4

cpe:2.3:a:jupyter:jupyter_server:2.12.4
Jupyter » Jupyter Server » Version: 2.12.5

cpe:2.3:a:jupyter:jupyter_server:2.12.5
Jupyter » Jupyter Server » Version: 2.13.0

cpe:2.3:a:jupyter:jupyter_server:2.13.0
Jupyter » Jupyter Server » Version: 2.14.0

cpe:2.3:a:jupyter:jupyter_server:2.14.0
Jupyter » Jupyter Server » Version: 2.14.1

cpe:2.3:a:jupyter:jupyter_server:2.14.1
Jupyter » Jupyter Server » Version: 2.14.2

cpe:2.3:a:jupyter:jupyter_server:2.14.2
Jupyter » Jupyter Server » Version: 2.15.0

cpe:2.3:a:jupyter:jupyter_server:2.15.0
Jupyter » Jupyter Server » Version: 2.16.0

cpe:2.3:a:jupyter:jupyter_server:2.16.0
Jupyter » Jupyter Server » Version: 2.17.0

cpe:2.3:a:jupyter:jupyter_server:2.17.0
Jupyter » Jupyter Server » Version: 2.18.0

cpe:2.3:a:jupyter:jupyter_server:2.18.0
Jupyter » Jupyter Server » Version: 2.18.1

cpe:2.3:a:jupyter:jupyter_server:2.18.1
Jupyter » Jupyter Server » Version: 2.18.2

cpe:2.3:a:jupyter:jupyter_server:2.18.2
Jupyter » Jupyter Server » Version: 2.2.0

cpe:2.3:a:jupyter:jupyter_server:2.2.0
Jupyter » Jupyter Server » Version: 2.2.1

cpe:2.3:a:jupyter:jupyter_server:2.2.1
Jupyter » Jupyter Server » Version: 2.3.0

cpe:2.3:a:jupyter:jupyter_server:2.3.0
Jupyter » Jupyter Server » Version: 2.4.0

cpe:2.3:a:jupyter:jupyter_server:2.4.0
Jupyter » Jupyter Server » Version: 2.5.0

cpe:2.3:a:jupyter:jupyter_server:2.5.0
Jupyter » Jupyter Server » Version: 2.6.0

cpe:2.3:a:jupyter:jupyter_server:2.6.0
Jupyter » Jupyter Server » Version: 2.7.0

cpe:2.3:a:jupyter:jupyter_server:2.7.0
Jupyter » Jupyter Server » Version: 2.7.1

cpe:2.3:a:jupyter:jupyter_server:2.7.1
Jupyter » Jupyter Server » Version: 2.7.2

cpe:2.3:a:jupyter:jupyter_server:2.7.2
Jupyter » Jupyter Server » Version: 2.7.3

cpe:2.3:a:jupyter:jupyter_server:2.7.3
Jupyter » Jupyter Server » Version: 2.8.0

cpe:2.3:a:jupyter:jupyter_server:2.8.0
Jupyter » Jupyter Server » Version: 2.9.0

cpe:2.3:a:jupyter:jupyter_server:2.9.0
Jupyter » Jupyter Server » Version: 2.9.1

cpe:2.3:a:jupyter:jupyter_server:2.9.1

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-44727

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