What’s Vulnerable › Vulnerabilities

CVE-2018-21030

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-10-31 · updated 2026-06-17
• Weakness: CWE-79

Description

Jupyter Notebook before 5.5.0 does not use a CSP header to treat served files as belonging to a separate origin. Thus, for example, an XSS payload can be placed in an SVG document.

Affected products

• jupyter notebook: before 5.5.0 — fixed in 5.5.0

How to fix

Upgrade to a fixed version: jupyter notebook 5.5.0. Check the vendor advisory for mitigations.

References

• https://github.com/jupyter/notebook/pull/3341
• https://github.com/jupyter/notebook/releases/tag/5.5.0
• https://lists.debian.org/debian-lts-announce/2020/11/msg00033.html
• https://github.com/jupyter/notebook/pull/3341
• https://github.com/jupyter/notebook/releases/tag/5.5.0
• https://lists.debian.org/debian-lts-announce/2020/11/msg00033.html

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