CVE-2020-26232 json
Open redirect in Jupyter Server
published 5y ago modified last mo. also GHSA-grfj-wjv9-4f9v , PYSEC-2020-234 , EUVD-2020-0090
- cvss
- 4.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 63%
- public exploits
- 0
- none known
Summary
Jupyter Server before version 1.0.6 has an Open redirect vulnerability. A maliciously crafted link to a jupyter server could redirect the browser to a different website. All jupyter servers are technically affected, however, these maliciously crafted links can only be reasonably made for known jupyter server hosts. A link to your jupyter server may appear safe, but ultimately redirect to a spoofed server on the public internet.
Patch / fix
- pypi jupyter-server 1.0.6
- jupyter jupyter_server 1.0.6
- jupyter-server Debian 14, Debian 13, Debian 12 1.0.7-1
debian advisories DEBIAN-CVE-2020-26232
- python-jupyter-server openSUSE Tumbleweed 2.20.0-1.3
opensuse advisories openSUSE-SU-2026:12012-1
Is CVE-2020-26232 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
1.00% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 5.5 | AV:N/AC:L/Au:S/C:P/I:P/A:N |
| GitHub | 3.1 | 4.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | jupyter-server | <1.0.6 |
1.0.6 |
Affected products
- jupyter jupyter_server
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
github.com
/jupyter-server/jupyter_server/commit/3d83e49090289c431da253e2bdb8dc479cbcb157
web, patch, third-party-advisory
-
github.com
/jupyter/jupyter_server/security/advisories/GHSA-grfj-wjv9-4f9v
web, third-party-advisory, advisory
-
github.com
/jupyter-server/jupyter_server/blob/master/CHANGELOG.md#106---2020-11-18
web, release-notes, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2020-26232
advisory
-
github.com
/jupyter-server/jupyter_server
package
-
github.com
/pypa/advisory-database/tree/main/vulns/jupyter-server/PYSEC-2020-234.yaml
web
Sources
- CVE List CVE-2020-26232
- GitHub Advisory GHSA-grfj-wjv9-4f9v
- NVD CVE-2020-26232
- OSV PYSEC-2020-234
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.