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CVE-2020-36191

Cross-Site Request Forgery in JupyterHub

4.5 MediumFix available

JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an _xsrf field, as demonstrated by a /hub/api/user request (to add or remove a user account).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
High
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
High
Availability
None

Exploit likelihood

0.51%Down 0.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 4.5

JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an _xsrf field, as demonstrated by a /hub/api/user request (to add or remove a user account).

Record
CVE-2020-36191
CVSS 3.1
4.5 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N
CVSS 2.0
3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness
CWE-352
Updated
2026-11-02
CVE List No score

JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an _xsrf field, as demonstrated by a /hub/api/user request (to add or remove a user account).

Record
CVE-2020-36191
Updated
2026-11-02
EUVDEUVD-2021-0106 No score

JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an _xsrf field, as demonstrated by a /hub/api/user request (to add or remove a user account).

Record
EUVD-2021-0106
Updated
2026-11-03
GitHub AdvisoriesGHSA-7xx3-qp5w-fw96 6.7

Cross-Site Request Forgery in JupyterHub

JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an _xsrf field, as demonstrated by a /hub/api/user request (to add or remove a user account).

Record
GHSA-7xx3-qp5w-fw96
CVSS 4.0
6.7 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
4.5 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N
Weakness
CWE-352
Updated
2026-11-02
OSV 4.5

JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an _xsrf field, as demonstrated by a /hub/api/user request (to add or remove a user account).

Record
CVE-2020-36191
CVSS 3.1
4.5 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2020-36191 4.5

JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an _xsrf field, as demonstrated by a /hub/api/user request (to add or remove a user account).

Record
DEBIAN-CVE-2020-36191
CVSS 3.1
4.5 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
Show 4 moreShow less
OSVGHSA-7xx3-qp5w-fw96 6.7

Cross-Site Request Forgery in JupyterHub

JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an _xsrf field, as demonstrated by a /hub/api/user request (to add or remove a user account).

Record
GHSA-7xx3-qp5w-fw96
CVSS 4.0
6.7 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
4.5 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N
Weakness
CWE-352
Updated
2026-11-02
OSVUBUNTU-CVE-2020-36191 4.5

JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an _xsrf field, as demonstrated by a /hub/api/user request (to add or remove a user account).

Record
UBUNTU-CVE-2020-36191
CVSS 3.1
4.5 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVBIT-jupyterhub-2020-36191 No score

JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an _xsrf field, as demonstrated by a /hub/api/user request (to add or remove a user account).

Record
BIT-jupyterhub-2020-36191
Updated
2026-11-02
OSVPYSEC-2021-67 No score

JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an _xsrf field, as demonstrated by a /hub/api/user request (to add or remove a user account).

Record
PYSEC-2021-67
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
jupyterhub
PyPI
 before 1.2.0b1
1.2.0b1
jupyterhub
Bitnami
 1.1.0 up to 1.1.1
1.1.1
jupyterhub
Debian:12
 before 3.0.0+ds1-1
3.0.0+ds1-1
jupyterhub
Debian:13
 before 3.0.0+ds1-1
3.0.0+ds1-1
jupyterhub
Debian:14
 before 3.0.0+ds1-1
3.0.0+ds1-1
jupyterhub
PyPI
 before 1.2.0b1, plus listed versions
0.1.00.2.00.3.00.4.00.4.1
Show 32 moreShow less
0.5.00.6.00.6.10.7.00.7.0b10.7.10.7.20.8.00.8.0b10.8.0b20.8.0b30.8.0b40.8.0b50.8.0rc10.8.0rc20.8.10.9.00.9.0b10.9.0b20.9.0b30.9.0rc10.9.10.9.20.9.30.9.40.9.50.9.61.0.01.0.0b11.0.0b21.1.01.1.0b1
1.2.0b1
jupyterhub
PyPI
 before 1.2.0b1, plus listed versions
0.1.00.2.00.3.00.4.00.4.1
Show 32 moreShow less
0.5.00.6.00.6.10.7.0b10.7.00.7.10.7.20.8.0b10.8.0b20.8.0b30.8.0b40.8.0b50.8.0rc10.8.0rc20.8.00.8.10.9.0b10.9.0b20.9.0b30.9.0rc10.9.00.9.10.9.20.9.30.9.40.9.50.9.61.0.0b11.0.0b21.0.01.1.0b11.1.0
1.2.0b1
jupyterhub
Ubuntu:22.04:LTS
 All versions, plus listed versions
2.0.0+ds1-12.0.0+ds1-2
 None known
jupyterhub
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.0.0+ds1-1
 None known
jupyterhub
Ubuntu:25.10
 All versions, plus listed versions
5.2.1+ds1-25.2.1+ds1-35.2.1+ds1-4
 None known
jupyterhub
Ubuntu:26.10
 All versions, plus listed versions
5.2.1+ds1-45.2.1+ds1-5
 None known
jupyterhub
Ubuntu:26.04:LTS
 All versions, plus listed versions
5.2.1+ds1-4
 None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-36191 is a medium vulnerability (CVSS 4.5) in Jupyter Jupyterhub, published January 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.51%, the 43rd percentile. Fixed in jupyterhub 1.2.0b1.

References

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