CVE-2020-36191Public exploitNetwork attack vector

Account creation or deletion via missing CSRF validation

Published Jan 13, 2021 · Updated Aug 4, 2024

CSRF in JupyterHub before 1.2.0b1 allows remote authenticated users to add or delete accounts through an administrator session. The admin panel accepts /hub/api/user add and delete requests when the _xsrf field is absent, relying solely on Referer validation. Exploitation requires an authenticated administrator session and browser interaction; the demonstrated consequence is unauthorized account creation or deletion.

CVSS severity6.7
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in JupyterHub before 1.2.0b1 allows remote authenticated users to add or delete accounts through an administrator session. The admin panel accepts /hub/api/user add and delete requests when the _xsrf field is absent, relying solely on Referer validation. Exploitation requires an authenticated administrator session and browser interaction; the demonstrated consequence is unauthorized account creation or deletion.

The record

CVE
CVE-2020-36191
Published
Jan 13, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-352, CAPEC-62, T1136, T1531
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.5NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N
3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
6.7GitHubCVSS: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 describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery
T1136Create Account
T1531Account Access Removal

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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