CVE Explorer

CVE-2026-40864

JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks. In versions 4.1.0 through 5.4.4, XSRF protection (updated in 4.1.0) inappropriately treated requests with Sec-Fetch-Mode: no-cors as same-origin requests, bypassing XSRF checks. The JSON API is not affected, only HTTP form endpoints, such as /hub/spawn and /hub/accept-share, meaning attackers could trigger server spawn (but not access the server) and if the attacker is a JupyterHub user permitted to sha

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a6e4d7cf5c856955654526a6fbd0e243aa58855fd4dc23b7d702302d4e0e294d

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"jupyterhub","vendor":"jupyterhub","versions":[{"status":"affected","version":">= 4.1.0, < 5.4.5"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:94e2206d02f3201316df555f48e48932ebf4df43158c970eac83dac8ff5aec14 · sha256:38d4b0b1468abe60… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:94e2206d02f3201316df555f48e48932ebf4df43158c970eac83dac8ff5aec14 · sha256:38d4b0b1468abe60… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-352","description":"CWE-352: Cross-Site Request Forgery (CSRF)","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:94e2206d02f3201316df555f48e48932ebf4df43158c970eac83dac8ff5aec14 · sha256:38d4b0b1468abe60… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/jupyterhub/jupyterhub/commit/9c5ec277d3cda5a59de2d8c8117efa77bd941127","tags":["x_refsource_MISC"],"url":"https://github.com/jupyterhub/jupyterhub/commit/9c5ec277d3cda5a59de2d8c8117efa77bd941127"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:94e2206d02f3201316df555f48e48932ebf4df43158c970eac83dac8ff5aec14 · sha256:38d4b0b1468abe60… · /containers/cna/references/1

{"name":"https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-m68r-v472-jgq9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-m68r-v472-jgq9"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:94e2206d02f3201316df555f48e48932ebf4df43158c970eac83dac8ff5aec14 · sha256:38d4b0b1468abe60… · /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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