{"schemaVersion":3,"id":"CVE-2026-67338","aliases":["GHSA-vmhf-c436-hxj4","UBUNTU-CVE-2026-67338","DEBIAN-CVE-2026-67338","BIT-jupyterlab-2026-67338"],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-08-01T12:22:17.437Z","modified":"2026-10-08T15:24:13.033Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.1,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":5.1,"severity":"medium","vector":"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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.1,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Pypi","score":5.1,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":5.1,"severity":"medium","vector":"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","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":6.1,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","exploitability":7.2,"impact":4.5,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Debian","score":5.1,"severity":"medium","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":5.1,"severity":"medium","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.1,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00305,"percentile":0.21993,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0.13300000000000003,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00172},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00305,"percentile":0.21993}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00172,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00305,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00305,"percentile":0.21993}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-84","name":"Improper Neutralization of Encoded URI Schemes in a Web Page","description":"The web application improperly neutralizes user-controlled input for executable script disguised with URI encodings.","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/84.html"}],"affected":[{"vendor":"debian","product":"jupyterlab","name":"jupyterlab","label":"jupyterlab","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/jupyterlab","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"jupyterlab","name":"jupyterlab","label":"jupyterlab","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/jupyterlab","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"jupyterlab","product":"jupyterlab","name":"jupyterlab","label":"jupyterlab","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 4.5.9","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.5.9","eol":null,"hubHref":"/vendor/jupyterlab/jupyterlab"},{"vendor":"PyPI","product":"jupyterlab","name":"jupyterlab","label":"jupyterlab","ecosystem":"PyPI","cpePart":null,"purl":"pkg:pypi/jupyterlab","purlType":"pypi","versions":[{"text":"< 4.5.9","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.5.9","eol":null,"hubHref":null}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vmhf-c436-hxj4","label":"github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vmhf-c436-hxj4","hostname":"github.com","tags":["Vendor Advisory","WEB","REPORT"]},{"url":"https://github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6","label":"github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6","hostname":"github.com","tags":["Patch","WEB","REPORT"]},{"url":"https://github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12","label":"github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12","hostname":"github.com","tags":["Patch","WEB","REPORT"]},{"url":"https://www.vulncheck.com/advisories/jupyterlab-before-stored-xss-via-extension-manager","label":"www.vulncheck.com/advisories/jupyterlab-before-stored-xss-via-extension-manager","hostname":"www.vulncheck.com","tags":["Third Party Advisory","REPORT"]},{"url":"https://github.com/jupyterlab/jupyterlab","label":"github.com/jupyterlab/jupyterlab","hostname":"github.com","tags":["PACKAGE"]},{"url":"https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.9","label":"github.com/jupyterlab/jupyterlab/releases/tag/v4.5.9","hostname":"github.com","tags":["WEB"]},{"url":"https://ubuntu.com/security/CVE-2026-67338","label":"ubuntu.com/security/CVE-2026-67338","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67338","label":"www.cve.org/CVERecord?id=CVE-2026-67338","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-67338","label":"security-tracker.debian.org/tracker/CVE-2026-67338","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-08-01T12:22:17.437Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-08T15:24:13.033Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":24,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T06:47:06.579Z","stale":false,"partial":false}}