JupyterLab: XSS due to lack of sanitization of the action attribute of an html <form>
Impact
Untrusted notebook can execute code on load. This is a remote code execution, but requires user action to open a notebook.
Patches
Patched in the following versions: 3.1.4, 3.0.17, 2.3.2, 2.2.10, 1.2.21.
References
OWASP Page on Restricting Form Submissions
For more information
If you have any questions or comments about this advisory, or vulnerabilities to report, please email our security list security@ipython.org.
Credit: Guillaume Jeanne from Google
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | jupyterlab | < 1.2.21, >= 2.0.0a0, < 2.2.10, >= 2.3.0a0, < 2.3.2, >= 3.0.0a0, < 3.0.17, >= 3.1.0a0, < 3.1.4 | 1.2.21, 2.2.10, 2.3.2, 3.0.17, 3.1.4 |
| Python (PyPI) | notebook | < 5.7.11, >= 6.0.0, < 6.4.1 | 5.7.11, 6.4.1 |
References
- https://github.com/jupyterlab/jupyterlab/commit/504825938c0abfa2fb8ff8d529308830a5ae42ed
- https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-4952-p58q-6crx
- https://github.com/google/security-research/security/advisories/GHSA-c469-p3jp-2vhx
- https://nvd.nist.gov/vuln/detail/CVE-2021-32797
- https://github.com/pypa/advisory-database/tree/main/vulns/jupyterlab/PYSEC-2021-130.yaml
- https://pypi.org/project/notebook
- https://github.com/advisories/GHSA-4952-p58q-6crx
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N- Weakness (CWE)
CWE-75, CWE-79, CWE-87- Platform
- Python (PyPI)
- Package
jupyterlab, notebook- Disclosed
- 09.08.2021
- Updated
- 11.10.2026 13:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2021-130 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-688 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-4952-p58q-6crx - CC BY 4.0
Vulnerability history: notebook
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 21
- First → latest
- 09.2015 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 8
- Medium 11
- Low 1
Disclosures per year
- 2017: 0
- 2018: 3
- 2019: 4
- 2020: 1
- 2021: 2
- 2022: 2
- 2023: 0
- 2024: 3
- 2025: 0
- 2026: 4
earlier: 2
-
JupyterLab: XSS due to lack of sanitization of the action attribute of an html <form> this entry
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