CVE Explorer

CVE-2026-33709

JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to version 5.4.4, an open redirect vulnerability in JupyterHub allows attackers to construct links which, when clicked, take users to the JupyterHub login page, after which they are sent to an arbitrary attacker-controlled site outside JupyterHub instead of a JupyterHub page, bypassing JupyterHub's check to prevent this. This issue has been patched in version 5.4.4.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2a60c78c6023d656b6e63ba6e3a4e6a1f3ed6547686c385174feff39a1356ce7

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"jupyterhub","vendor":"jupyterhub","versions":[{"status":"affected","version":"< 5.4.4"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:977eb940c8020e50730ab0a9905ce21bebcab736edbae13c05ffe5a4da62e36c · sha256:a5d488070a7f670c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:977eb940c8020e50730ab0a9905ce21bebcab736edbae13c05ffe5a4da62e36c · sha256:a5d488070a7f670c… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-601","description":"CWE-601: URL Redirection to Untrusted Site ('Open Redirect')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:977eb940c8020e50730ab0a9905ce21bebcab736edbae13c05ffe5a4da62e36c · sha256:a5d488070a7f670c… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/jupyterhub/jupyterhub/releases/tag/5.4.4","tags":["x_refsource_MISC"],"url":"https://github.com/jupyterhub/jupyterhub/releases/tag/5.4.4"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:977eb940c8020e50730ab0a9905ce21bebcab736edbae13c05ffe5a4da62e36c · sha256:a5d488070a7f670c… · /containers/cna/references/1

{"name":"https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8","tags":["x_refsource_CONFIRM"],"url":"https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:977eb940c8020e50730ab0a9905ce21bebcab736edbae13c05ffe5a4da62e36c · sha256:a5d488070a7f670c… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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