CVE-2026-40171
CVE-2026-40171 · Jupyter Notebook and JupyterLab token theft via stored XSS in help command linker
This page contains facts from public vulnerability sources. Check the original advisory before updating.
This page shows selected source facts. See the linked advisories for the complete description and affected versions.
In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding @jupyter-notebook/help-extension and @jupyterlab/help-extension packages before 7.5.6 and 4.5.7, a stored cross-site scripting issue in the help command linker can be chained with attacker-controlled notebook content to steal authentication tokens with a single click. An attacker can craft a malicious notebook file containing elements that appear indistinguishable from legitimate controls and trigger execution when a user interacts with them. Successful exploitation allows theft of the user's authentication token and complete takeover of the Jupyter session through the REST API, including reading files, creating or modifying files, accessing kernels to execute arbitrary code, and creating terminals for shell access. This issue has been fixed in Notebook 7.5.6, JupyterLab 4.5.7, @jupyter-notebook/help-extension 7.5.6, and @jupyterlab/help-extension 4.5.7. As a workaround, disable the affected help extensions or set allowCommandLinker to false in the sanitizer configuration.
CVSS 8.4 · High · EPSS 0.5% · Fix available
- Published
- Updated
Affected products and versions
notebook
- Versions
- >=7.0.0, <= 7.5.5: Affected
No fix published
help-extension
- Versions
- <=4.5.6: Affected
No fix published
jupyterlab
- Versions
- <= 4.5.6: Affected
No fix published
help-extension
- Versions
- >=7.0.0,<= 7.5.5: Affected
No fix published
jupyter-notebook Debian:14
- Versions
- 6.4.13-5
- 7.0.0-1
- 7.0.0-2
- 7.4.7-1
- 7.4.7-2
- Affected ranges
- ECOSYSTEM: < 7.4.7-3
Update to 7.4.7-3
jupyterlab Debian:13
- Versions
- 4.0.11+ds1+~cs11.25.27-7
- 4.0.11+ds1+~cs11.25.27-8
- 4.0.11+ds1+~cs11.25.27-9
- 4.0.11+ds2+~cs11.25.27-1
- 4.0.11+ds2+~cs11.25.27-3
- 4.0.11+ds3+~cs11.25.27-1
- 4.0.11+ds4+~cs11.25.27-1
- 4.0.11+ds4+~cs11.25.27-2
- 4.0.11+ds4+~cs11.25.27-3
- 4.0.11+ds4+~cs11.25.27-4
- 4.0.11+ds5+~cs11.25.27-1
- 4.0.13+ds1+~2.0.1+~cs1.4.4-1
- 4.1.3+ds1+~2.0.1+~0.15.3+~cs1.4.4-1
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-1
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-2
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-3
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-4
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-5
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-6
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-7
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-8
- 4.4.1+ds1+~3.0.5+~0.16.6+~cs1.4.4-1
- 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-1
- 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-2
- 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3
- 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4
- 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-5
- 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-6
- 4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jupyterlab Debian:14
- Versions
- 4.0.11+ds1+~cs11.25.27-7
- 4.0.11+ds1+~cs11.25.27-8
- 4.0.11+ds1+~cs11.25.27-9
- 4.0.11+ds2+~cs11.25.27-1
- 4.0.11+ds2+~cs11.25.27-3
- 4.0.11+ds3+~cs11.25.27-1
- 4.0.11+ds4+~cs11.25.27-1
- 4.0.11+ds4+~cs11.25.27-2
- 4.0.11+ds4+~cs11.25.27-3
- 4.0.11+ds4+~cs11.25.27-4
- 4.0.11+ds5+~cs11.25.27-1
- 4.0.13+ds1+~2.0.1+~cs1.4.4-1
- 4.1.3+ds1+~2.0.1+~0.15.3+~cs1.4.4-1
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-1
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-2
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-3
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-4
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-5
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-6
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-7
- 4.1.8+ds1+~2.0.1+~0.15.3+~cs1.4.4-8
- 4.4.1+ds1+~3.0.5+~0.16.6+~cs1.4.4-1
- 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-1
- 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-2
- 4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1
- Affected ranges
- ECOSYSTEM: < 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3
Update to 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3
@jupyter-notebook/help-extension npm
- Affected ranges
- SEMVER: ≥ 7.0.0, < 7.5.6
Update to 7.5.6
notebook PyPI
- Versions
- 7.0.0
- 7.0.1
- 7.0.2
- 7.0.3
- 7.0.4
- 7.0.5
- 7.0.6
- 7.0.7
- 7.0.8
- 7.1.0
- 7.1.0a0
- 7.1.0a1
- 7.1.0a2
- 7.1.0b0
- 7.1.0rc0
- 7.1.0rc1
- 7.1.1
- 7.1.2
- 7.1.3
- 7.2.0
- 7.2.0a0
- 7.2.0b0
- 7.2.0b1
- 7.2.0rc0
- 7.2.0rc1
- 7.2.1
- 7.2.2
- 7.2.3
- 7.3.0
- 7.3.0a0
- 7.3.0a1
- 7.3.0b0
- 7.3.0b1
- 7.3.0b2
- 7.3.0rc0
- 7.3.1
- 7.3.2
- 7.3.3
- 7.4.0
- 7.4.0a0
- 7.4.0a1
- 7.4.0a2
- 7.4.0a3
- 7.4.0b0
- 7.4.0b1
- 7.4.0b2
- 7.4.0b3
- 7.4.0rc0
- 7.4.1
- 7.4.2
- 7.4.3
- 7.4.4
- 7.4.5
- 7.4.6
- 7.4.7
- 7.5.0
- 7.5.0a0
- 7.5.0a1
- 7.5.0a2
- 7.5.0a3
- 7.5.0b0
- 7.5.0b1
- 7.5.0rc0
- 7.5.0rc1
- 7.5.1
- 7.5.2
- 7.5.3
- 7.5.4
- 7.5.5
- Affected ranges
- ECOSYSTEM: ≥ 7.0.0, < 7.5.6
Update to 7.5.6
jupyterlab PyPI
- Versions
- 0.0.1
- 0.0.10
- 0.0.13
- 0.0.2
- 0.0.3
- 0.0.4
- 0.0.5
- 0.0.6
- 0.0.7
- 0.0.8
- 0.0.9
- 0.1.1
- 0.1.2
- 0.10.0
- 0.11.0
- 0.11.1
- 0.11.2
- 0.11.3
- 0.12.0
- 0.12.1
- 0.13.0
- 0.13.1
- 0.13.2
- 0.14.0
- 0.15.0
- 0.15.1
- 0.16.0
- 0.16.2
- 0.17.0
- 0.17.1
- 0.17.2
- 0.17.4
- 0.17.5
- 0.18.0
- 0.18.0.dev1
- 0.18.1
- 0.19.0
- 0.2.0
- 0.20.0
- 0.20.0rc1
- 0.20.1
- 0.20.2
- 0.20.3
- 0.20.4
- 0.21.0
- 0.21.0rc1
- 0.21.0rc2
- 0.21.0rc3
- 0.21.0rc4
- 0.21.0rc5
- 0.22.0
- 0.22.0rc0
- 0.22.1
- 0.23.0
- 0.23.0rc0
- 0.23.0rc1
- 0.23.1
- 0.23.2
- 0.24.0
- 0.24.0rc0
- 0.24.0rc1
- 0.24.0rc2
- 0.24.1
- 0.25.0
- 0.25.0rc0
- 0.25.0rc1
- 0.25.1
- 0.25.2
- 0.25.2rc0
- 0.26.0
- 0.26.0rc0
- 0.26.0rc1
- 0.26.1
- 0.26.2
- 0.26.3
- 0.26.4
- 0.26.5
- 0.27.0
- 0.27.0rc0
- 0.27.0rc1
- 0.27.0rc2
- 0.27.0rc3
- 0.27.0rc4
- 0.27.0rc5
- 0.27.1
- 0.27.2
- 0.28.0
- 0.28.0rc0
- 0.28.0rc1
- 0.28.0rc2
- 0.28.0rc3
- 0.28.1
- 0.28.10
- 0.28.11
- 0.28.12
- 0.28.13
- 0.28.14
- 0.28.15
- 0.28.2
- 0.28.3
- 0.28.4
- 0.28.5
- 0.28.6
- 0.28.7
- 0.28.8
- 0.29.0
- 0.29.0rc0
- 0.29.1
- 0.29.2
- 0.3.0
- 0.30.0
- 0.30.0rc0
- 0.30.0rc1
- 0.30.1
- 0.30.2
- 0.30.3
- 0.30.4
- 0.30.5
- 0.30.6
- 0.31.0
- 0.31.0rc0
- 0.31.0rc1
- 0.31.0rc2
- 0.31.1
- 0.31.10
- 0.31.11
- 0.31.12
- 0.31.2
- 0.31.3
- 0.31.4
- 0.31.5
- 0.31.6
- 0.31.7
- 0.31.8
- 0.31.9
- 0.32.0
- 0.32.0rc0
- 0.32.0rc1
- 0.32.1
- 0.33.0
- 0.33.0rc0
- 0.33.0rc1
- 0.33.1
- 0.33.10
- 0.33.11
- 0.33.12
- 0.33.2
- 0.33.3
- 0.33.4
- 0.33.5
- 0.33.6
- 0.33.7
- 0.33.8
- 0.33.9
- 0.34.0
- 0.34.0rc0
- 0.34.0rc1
- 0.34.0rc2
- 0.34.1
- 0.34.10
- 0.34.11
- 0.34.12
- 0.34.2
- 0.34.3
- 0.34.4
- 0.34.5
- 0.34.6
- 0.34.7
- 0.34.8
- 0.34.9
- 0.35.0
- 0.35.0rc0
- 0.35.0rc1
- 0.35.0rc2
- 0.35.1
- 0.35.2
- 0.35.3
- 0.35.4
- 0.35.5
- 0.35.6
- 0.4.0
- 0.4.1
- 0.5.0
- 0.6.0
- 0.7.0
- 0.8.0
- 0.9.0
- 0.9.1
- 1.0.0
- 1.0.0a0
- 1.0.0a1
- 1.0.0a10
- 1.0.0a2
- 1.0.0a3
- 1.0.0a4
- 1.0.0a5
- 1.0.0a6
- 1.0.0a7
- 1.0.0a8
- 1.0.0a9
- 1.0.0rc0
- 1.0.0rc1
- 1.0.1
- 1.0.10
- 1.0.2
- 1.0.3
- 1.0.4
- 1.0.5
- 1.0.6
- 1.0.7
- 1.0.9
- 1.1.0
- 1.1.0a0
- 1.1.0a1
- 1.1.0a2
- 1.1.0rc0
- 1.1.1
- 1.1.2
- 1.1.3
- 1.1.4
- 1.1.5
- 1.2.0
- 1.2.0a0
- 1.2.0a1
- 1.2.0a2
- 1.2.0a3
- 1.2.0rc0
- 1.2.1
- 1.2.10
- 1.2.11
- 1.2.12
- 1.2.13
- 1.2.14
- 1.2.15
- 1.2.16
- 1.2.17
- 1.2.18
- 1.2.19
- 1.2.2
- 1.2.20
- 1.2.21
- 1.2.3
- 1.2.4
- 1.2.5
- 1.2.6
- 1.2.7
- 1.2.8
- 1.2.9
- 2.0.0
- 2.0.0a0
- 2.0.0a1
- 2.0.0a3
- 2.0.0a4
- 2.0.0b1
- 2.0.0b2
- 2.0.0b3
- 2.0.0rc0
- 2.0.0rc1
- 2.0.0rc2
- 2.0.1
- 2.0.1rc0
- 2.0.2
- 2.1.0
- 2.1.0a0
- 2.1.0b0
- 2.1.0rc0
- 2.1.1
- 2.1.2
- 2.1.3
- 2.1.4
- 2.1.5
- 2.2.0
- 2.2.0a0
- 2.2.0a1
- 2.2.0rc1
- 2.2.1
- 2.2.10
- 2.2.2
- 2.2.4
- 2.2.5
- 2.2.6
- 2.2.7
- 2.2.8
- 2.2.9
- 2.3.0
- 2.3.0a0
- 2.3.0a1
- 2.3.0a2
- 2.3.0rc0
- 2.3.1
- 2.3.2
- 3.0.0
- 3.0.0a0
- 3.0.0a10
- 3.0.0a11
- 3.0.0a12
- 3.0.0a13
- 3.0.0a14
- 3.0.0a3
- 3.0.0a4
- 3.0.0a5
- 3.0.0a6
- 3.0.0a7
- 3.0.0a8
- 3.0.0a9
- 3.0.0b1
- 3.0.0b2
- 3.0.0b3
- 3.0.0b4
- 3.0.0b6
- 3.0.0b7
- 3.0.0b8
- 3.0.0rc0
- 3.0.0rc1
- 3.0.0rc10
- 3.0.0rc11
- 3.0.0rc12
- 3.0.0rc13
- 3.0.0rc14
- 3.0.0rc15
- 3.0.0rc2
- 3.0.0rc3
- 3.0.0rc4
- 3.0.0rc5
- 3.0.0rc6
- 3.0.0rc7
- 3.0.0rc8
- 3.0.0rc9
- 3.0.1
- 3.0.10
- 3.0.11
- 3.0.12
- 3.0.13
- 3.0.14
- 3.0.15
- 3.0.16
- 3.0.17
- 3.0.18
- 3.0.2
- 3.0.3
- 3.0.4
- 3.0.5
- 3.0.6
- 3.0.7
- 3.0.8
- 3.0.9
- 3.1.0
- 3.1.0a0
- 3.1.0a1
- 3.1.0a10
- 3.1.0a11
- 3.1.0a12
- 3.1.0a13
- 3.1.0a2
- 3.1.0a3
- 3.1.0a4
- 3.1.0a5
- 3.1.0a6
- 3.1.0a7
- 3.1.0a8
- 3.1.0a9
- 3.1.0b0
- 3.1.0b1
- 3.1.0rc1
- 3.1.0rc2
- 3.1.1
- 3.1.10
- 3.1.11
- 3.1.12
- 3.1.13
- 3.1.14
- 3.1.16
- 3.1.17
- 3.1.18
- 3.1.19
- 3.1.2
- 3.1.4
- 3.1.6
- 3.1.7
- 3.1.8
- 3.1.9
- 3.2.0
- 3.2.0a0
- 3.2.0a1
- 3.2.0b0
- 3.2.0rc0
- 3.2.1
- 3.2.2
- 3.2.3
- 3.2.4
- 3.2.5
- 3.2.6
- 3.2.7
- 3.2.8
- 3.2.9
- 3.3.0
- 3.3.0a1
- 3.3.0a2
- 3.3.0a3
- 3.3.0b0
- 3.3.0rc0
- 3.3.1
- 3.3.2
- 3.3.3
- 3.3.4
- 3.4.0
- 3.4.0a0
- 3.4.0b0
- 3.4.0rc0
- 3.4.1
- 3.4.2
- 3.4.3
- 3.4.4
- 3.4.5
- 3.4.6
- 3.4.7
- 3.4.8
- 3.5.0
- 3.5.0a0
- 3.5.0b0
- 3.5.0rc0
- 3.5.1
- 3.5.2
- 3.5.3
- 3.6.0
- 3.6.0a0
- 3.6.0a1
- 3.6.0a2
- 3.6.0a3
- 3.6.0a4
- 3.6.0a5
- 3.6.0b0
- 3.6.0rc0
- 3.6.0rc1
- 3.6.1
- 3.6.2
- 3.6.3
- 3.6.4
- 3.6.5
- 3.6.6
- 3.6.7
- 3.6.8
- 4.0.0
- 4.0.0a0
- 4.0.0a1
- 4.0.0a10
- 4.0.0a11
- 4.0.0a12
- 4.0.0a13
- 4.0.0a14
- 4.0.0a15
- 4.0.0a16
- 4.0.0a17
- 4.0.0a18
- 4.0.0a19
- 4.0.0a20
- 4.0.0a21
- 4.0.0a22
- 4.0.0a23
- 4.0.0a24
- 4.0.0a25
- 4.0.0a26
- 4.0.0a27
- 4.0.0a28
- 4.0.0a29
- 4.0.0a3
- 4.0.0a30
- 4.0.0a31
- 4.0.0a32
- 4.0.0a33
- 4.0.0a34
- 4.0.0a35
- 4.0.0a36
- 4.0.0a4
- 4.0.0a6
- 4.0.0a7
- 4.0.0a8
- 4.0.0a9
- 4.0.0b0
Update to 4.5.7
@jupyterlab/help-extension npm
- Affected ranges
- SEMVER: < 4.5.7
Update to 4.5.7
jupyter-notebook Ubuntu:18.04:LTS
- Versions
- 4.2.3-4
- 5.1.0-2
- 5.2.1-2
- 5.2.2-1
- 5.2.2-1ubuntu0.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jupyter-notebook Ubuntu:20.04:LTS
- Versions
- 5.7.8-1
- 6.0.0-1
- 6.0.0-2
- 6.0.2-1
- 6.0.3-1
- 6.0.3-2
- 6.0.3-2ubuntu0.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jupyter-notebook Ubuntu:Pro:22.04:LTS
- Versions
- 6.2.0-1
- 6.4.5-2
- 6.4.5-3
- 6.4.5-4
- 6.4.8-1
- 6.4.8-1ubuntu0.1
- 6.4.8-1ubuntu0.1+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jupyter-notebook Ubuntu:Pro:24.04:LTS
- Versions
- 6.4.12-2.2
- 6.4.12-2.2ubuntu1
- 6.4.12-2.2ubuntu1+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jupyter-notebook Ubuntu:25.10
- Versions
- 6.4.13-5
- 6.4.13-5ubuntu0.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jupyter-notebook Ubuntu:26.10
- Versions
- 6.4.13-5ubuntu0.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jupyter-notebook Ubuntu:26.04:LTS
- Versions
- 6.4.13-5ubuntu0.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published