Vulnerability-Lookup

ubuntu-cve-2026-67338

Vulnerability from osv_ubuntu

Published

2026-08-04 00:00

Modified

2026-08-04 00:00

Summary

Details

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.

Severity

6.1 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

5.1 (Medium)


                    
                      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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-67338	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-67338	REPORT
	https://github.com/jupyterlab/jupyterlab/security…	REPORT
	https://github.com/jupyterlab/jupyterlab/commit/4…	REPORT
	https://github.com/jupyterlab/jupyterlab/commit/d…	REPORT
	https://github.com/jupyterlab/jupyterlab/commit/4…	REPORT
	https://github.com/jupyterlab/jupyterlab/commit/d…	REPORT
	https://www.vulncheck.com/advisories/jupyterlab-b…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "jupyterlab",
            "binary_version": "4.0.11+ds1+~cs11.25.27-9"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "jupyterlab",
        "purl": "pkg:deb/ubuntu/jupyterlab@4.0.11+ds1+~cs11.25.27-9?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.11+ds1+~cs11.25.27-7",
        "4.0.11+ds1+~cs11.25.27-8",
        "4.0.11+ds1+~cs11.25.27-9"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2026-67338",
  "modified": "2026-08-04T00:00:00Z",
  "published": "2026-08-04T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-67338"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-67338"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vmhf-c436-hxj4"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/jupyterlab-before-stored-xss-via-extension-manager"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-67338"
  ]
}

CVE-2026-67338 (GCVE-0-2026-67338)

Vulnerability from cvelistv5 – Published: 2026-08-01 12:22 – Updated: 2026-08-03 19:36

Title

JupyterLab before 4.5.9 Stored XSS via Extension Manager

Summary

Severity

5.1 (Medium)


                        
                          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

6.1 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-84 - Improper Neutralization of Encoded URI Schemes in a Web Page

Assigner

VulnCheck

References

4 references

URL	Tags
https://github.com/jupyterlab/jupyterlab/security…	vendor-advisory
https://github.com/jupyterlab/jupyterlab/commit/4…	patch
https://github.com/jupyterlab/jupyterlab/commit/d…	patch
https://www.vulncheck.com/advisories/jupyterlab-b…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
jupyterlab	jupyterlab	Affected: 0 , < 4.5.9 (semver) Unaffected: 4.5.9 (semver)

Date Public

2026-06-18 00:00

Credits

krassowski Yann-P

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-67338",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-03T19:36:31.254675Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-03T19:36:40.296Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:jupyter:jupyterlab:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.5.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "krassowski"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Yann-P"
        }
      ],
      "datePublic": "2026-06-18T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "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": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "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"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-84",
              "description": "Improper Neutralization of Encoded URI Schemes in a Web Page",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-01T12:22:17.437Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-vmhf-c436-hxj4)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vmhf-c436-hxj4"
        },
        {
          "name": "Patch Commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6"
        },
        {
          "name": "Patch Commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12"
        },
        {
          "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"
        }
      ],
      "title": "JupyterLab before 4.5.9 Stored XSS via Extension Manager",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-67338",
    "datePublished": "2026-08-01T12:22:17.437Z",
    "dateReserved": "2026-07-29T13:09:45.992Z",
    "dateUpdated": "2026-08-03T19:36:40.296Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

ubuntu-cve-2026-67338

Vulnerability from osv_ubuntu

CVE-2026-67338 (GCVE-0-2026-67338)

Tags

Sightings

Nomenclature