CVE-2026-102831 (GCVE-0-2026-102831)

Vulnerability from cvelistv5 – Published: 2026-09-29 18:58 – Updated: 2026-09-29 18:58
VLAI
Title
JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard
Summary
JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From JupyterLab 4.5.0 until 4.5.11 and 4.6.4, from Notebook 7.5.0 until 7.6.3, and from JupyterLite Core 0.7.0 until 0.8.4, the system clipboard cell-paste path accepts attacker-controlled cell JSON without clearing metadata.trusted. When useSystemClipboardForCells is active and pasteCodeCellsWithoutOutput is disabled, a pasted code cell can mark HTML output as trusted, bypass output sanitization, and execute script in the authenticated JupyterLab origin without executing the cell. Markdown and raw cells are not affected because their output is sanitized. This issue is fixed in JupyterLab 4.5.11 and 4.6.4, Notebook 7.6.3, and JupyterLite Core 0.8.4.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  • CWE-345 - Insufficient Verification of Data Authenticity
Assigner
References
Impacted products
Vendor Product Version CPE status
jupyterlab jupyterlab Affected: >= 4.5.0, < 4.5.11
Affected: >= 4.6.0, < 4.6.4
guessed Create a notification for this product.
jupyterlab notebook Affected: >= 7.5.0, < 7.6.3
guessed Create a notification for this product.
jupyterlab jupyterlite-core Affected: >= 0.7.0, < 0.8.4
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "jupyterlab",
          "vendor": "jupyterlab",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.5.0, \u003c 4.5.11"
            },
            {
              "status": "affected",
              "version": "\u003e= 4.6.0, \u003c 4.6.4"
            }
          ]
        },
        {
          "product": "notebook",
          "vendor": "jupyterlab",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 7.5.0, \u003c 7.6.3"
            }
          ]
        },
        {
          "product": "jupyterlite-core",
          "vendor": "jupyterlab",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.7.0, \u003c 0.8.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From JupyterLab 4.5.0 until 4.5.11 and 4.6.4, from Notebook 7.5.0 until 7.6.3, and from JupyterLite Core 0.7.0 until 0.8.4, the system clipboard cell-paste path accepts attacker-controlled cell JSON without clearing metadata.trusted. When useSystemClipboardForCells is active and pasteCodeCellsWithoutOutput is disabled, a pasted code cell can mark HTML output as trusted, bypass output sanitization, and execute script in the authenticated JupyterLab origin without executing the cell. Markdown and raw cells are not affected because their output is sanitized. This issue is fixed in JupyterLab 4.5.11 and 4.6.4, Notebook 7.6.3, and JupyterLite Core 0.8.4."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-345",
              "description": "CWE-345: Insufficient Verification of Data Authenticity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-29T18:58:03.634Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-6966-vjj6-99xv",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-6966-vjj6-99xv"
        },
        {
          "name": "https://github.com/jupyterlab/jupyterlab/commit/1a10a7da5ff655849b21581c2633b46483ae0be9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/jupyterlab/jupyterlab/commit/1a10a7da5ff655849b21581c2633b46483ae0be9"
        },
        {
          "name": "https://github.com/jupyterlab/jupyterlab/commit/7f9f29e29e0c83fb17b0f11da57d06b3c6a40d96",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/jupyterlab/jupyterlab/commit/7f9f29e29e0c83fb17b0f11da57d06b3c6a40d96"
        },
        {
          "name": "https://github.com/jupyterlab/jupyterlab/commit/cf6e89a8d315c4134cefa50c220bca296da466a7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/jupyterlab/jupyterlab/commit/cf6e89a8d315c4134cefa50c220bca296da466a7"
        },
        {
          "name": "https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.11",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.11"
        },
        {
          "name": "https://github.com/jupyterlab/jupyterlab/releases/tag/v4.6.4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/jupyterlab/jupyterlab/releases/tag/v4.6.4"
        }
      ],
      "source": {
        "advisory": "GHSA-6966-vjj6-99xv",
        "discovery": "UNKNOWN"
      },
      "title": "JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-102831",
    "datePublished": "2026-09-29T18:58:03.634Z",
    "dateReserved": "2026-09-29T17:25:25.266Z",
    "dateUpdated": "2026-09-29T18:58:03.634Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "jupyterlab",
                "vendor": "jupyterlab",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 4.5.0, \u003c 4.5.11"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 4.6.0, \u003c 4.6.4"
                  }
                ]
              },
              {
                "product": "notebook",
                "vendor": "jupyterlab",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 7.5.0, \u003c 7.6.3"
                  }
                ]
              },
              {
                "product": "jupyterlite-core",
                "vendor": "jupyterlab",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 0.7.0, \u003c 0.8.4"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From JupyterLab 4.5.0 until 4.5.11 and 4.6.4, from Notebook 7.5.0 until 7.6.3, and from JupyterLite Core 0.7.0 until 0.8.4, the system clipboard cell-paste path accepts attacker-controlled cell JSON without clearing metadata.trusted. When useSystemClipboardForCells is active and pasteCodeCellsWithoutOutput is disabled, a pasted code cell can mark HTML output as trusted, bypass output sanitization, and execute script in the authenticated JupyterLab origin without executing the cell. Markdown and raw cells are not affected because their output is sanitized. This issue is fixed in JupyterLab 4.5.11 and 4.6.4, Notebook 7.6.3, and JupyterLite Core 0.8.4."
          }
        ],
        "id": "CVE-2026-102831",
        "lastModified": "2026-09-29T19:17:25.700",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 8.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 5.2,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-29T19:17:25.700",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/jupyterlab/jupyterlab/commit/1a10a7da5ff655849b21581c2633b46483ae0be9"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/jupyterlab/jupyterlab/commit/7f9f29e29e0c83fb17b0f11da57d06b3c6a40d96"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/jupyterlab/jupyterlab/commit/cf6e89a8d315c4134cefa50c220bca296da466a7"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.11"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/jupyterlab/jupyterlab/releases/tag/v4.6.4"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-6966-vjj6-99xv"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-79"
              },
              {
                "lang": "en",
                "value": "CWE-345"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-29T19:27:08+00:00",
      "cve": "CVE-2026-102831",
      "id": "CVE-2026-102831",
      "initial_release_date": "2026-09-29T18:58:03.634000+00:00",
      "product_status:known_affected": "21",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "jupyterlab: JupyterLab: Cross-Site Scripting via malicious clipboard cell pasting",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102831.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.



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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.