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CVE-2026-67338

JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4c0aa93bab5fbc160fb22630ab71dab7cb4fe7b23e10d17f0d54e8249ae9e8a1
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:26e24d4f9a3c067c9421918a3cae1b03ac3d34e649d8660517230913cfff4921 · sha256:39c092655797f2a4… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact"…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:26e24d4f9a3c067c9421918a3cae1b03ac3d34e649d8660517230913cfff4921 · sha256:39c092655797f2a4… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"jupyterlab","vendor":"jupyterlab","versions":[{"lessThan":"4.5.9","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"4.5.9","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:26e24d4f9a3c067c9421918a3cae1b03ac3d34e649d8660517230913cfff4921 · sha256:39c092655797f2a4… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:26e24d4f9a3c067c9421918a3cae1b03ac3d34e649d8660517230913cfff4921 · sha256:39c092655797f2a4… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:26e24d4f9a3c067c9421918a3cae1b03ac3d34e649d8660517230913cfff4921 · sha256:39c092655797f2a4… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-84","description":"Improper Neutralization of Encoded URI Schemes in a Web Page","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:26e24d4f9a3c067c9421918a3cae1b03ac3d34e649d8660517230913cfff4921 · sha256:39c092655797f2a4… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"Patch Commit","tags":["patch"],"url":"https://github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:26e24d4f9a3c067c9421918a3cae1b03ac3d34e649d8660517230913cfff4921 · sha256:39c092655797f2a4… · /containers/cna/references/1
{"name":"Patch Commit","tags":["patch"],"url":"https://github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:26e24d4f9a3c067c9421918a3cae1b03ac3d34e649d8660517230913cfff4921 · sha256:39c092655797f2a4… · /containers/cna/references/2
{"name":"GitHub Security Advisory (GHSA-vmhf-c436-hxj4)","tags":["vendor-advisory"],"url":"https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vmhf-c436-hxj4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:26e24d4f9a3c067c9421918a3cae1b03ac3d34e649d8660517230913cfff4921 · sha256:39c092655797f2a4… · /containers/cna/references/0
{"name":"VulnCheck Advisory: JupyterLab before 4.5.9 Stored XSS via Extension Manager","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/jupyterlab-before-stored-xss-via-extension-manager"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:26e24d4f9a3c067c9421918a3cae1b03ac3d34e649d8660517230913cfff4921 · sha256:39c092655797f2a4… · /containers/cna/references/3

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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