Vulnerability-Lookup

CVE-2026-40864 (GCVE-0-2026-40864)

Vulnerability from cvelistv5 – Published: 2026-05-22 20:13 – Updated: 2026-05-26 13:13

Title

JupyterHub: Cross-origin form POSTs bypass XSRF

Summary

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 share access to their server, cause a user to accept a share and have access to the attacker's server. This issue has been fixed in version 5.4.5. If developers are unable to immediately upgrade, they can temporarily mitigate this issue by dropping requests to JupyterHub with Sec-Fetch-Mode: no-cors if they are using a reverse proxy.

Severity

5.4 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-352 - Cross-Site Request Forgery (CSRF)

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/jupyterhub/jupyterhub/security…	x_refsource_CONFIRM
https://github.com/jupyterhub/jupyterhub/commit/9…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
jupyterhub	jupyterhub	Affected: >= 4.1.0, < 5.4.5

Show details on NVD website

JSON

To clipboard

{
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        "metrics": [
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              "content": {
                "id": "CVE-2026-40864",
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        "discovery": "UNKNOWN"
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      "title": "JupyterHub: Cross-origin form POSTs bypass XSRF"
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      "title": "JupyterHub: Cross-origin form POSTs bypass XSRF",
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bit-jupyterhub-2026-40864

Vulnerability from bitnami_vulndb

Published

2026-05-28 08:43

Modified

2026-06-05 06:08

Summary

JupyterHub: Cross-origin form POSTs bypass XSRF

Details

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "jupyterhub",
        "purl": "pkg:bitnami/jupyterhub"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.1.0"
            },
            {
              "fixed": "5.4.5"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40864"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:jupyter:jupyterhub:*:*:*:*:*:python:*:*"
    ],
    "severity": "Medium"
  },
  "details": "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 share access to their server, cause a user to accept a share and have access to the attacker\u0027s server. This issue has been fixed in version 5.4.5. If developers are unable to immediately upgrade, they can temporarily mitigate this issue by dropping requests to JupyterHub with Sec-Fetch-Mode: no-cors if they are using a reverse proxy.",
  "id": "BIT-jupyterhub-2026-40864",
  "modified": "2026-06-05T06:08:58.631Z",
  "published": "2026-05-28T08:43:54.207Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/jupyterhub/jupyterhub/commit/9c5ec277d3cda5a59de2d8c8117efa77bd941127"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-m68r-v472-jgq9"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40864"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "JupyterHub: Cross-origin form POSTs bypass XSRF"
}

FKIE_CVE-2026-40864

Vulnerability from fkie_nvd - Published: 2026-05-22 21:16 - Updated: 2026-06-17 10:45

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/jupyterhub/jupyterhub/commit/9c5ec277d3cda5a59de2d8c8117efa77bd941127	Patch
	security-advisories@github.com	https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-m68r-v472-jgq9	Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	jupyter	jupyterhub	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "jupyterhub",
          "vendor": "jupyterhub",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.1.0, \u003c 5.4.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
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              "criteria": "cpe:2.3:a:jupyter:jupyterhub:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "81612D2F-7819-4502-B4B1-F9FBFA915A42",
              "versionEndExcluding": "5.4.5",
              "versionStartIncluding": "4.1.0",
              "vulnerable": true
            }
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          "negate": false,
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      "lang": "en",
      "value": "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 share access to their server, cause a user to accept a share and have access to the attacker\u0027s server. This issue has been fixed in version 5.4.5. If developers are unable to immediately upgrade, they can temporarily mitigate this issue by dropping requests to JupyterHub with Sec-Fetch-Mode: no-cors if they are using a reverse proxy."
    }
  ],
  "id": "CVE-2026-40864",
  "lastModified": "2026-06-17T10:45:47.270",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
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        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
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          "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:N",
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        },
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        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
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  "published": "2026-05-22T21:16:43.177",
  "references": [
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      "source": "security-advisories@github.com",
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        "Vendor Advisory"
      ],
      "url": "https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-m68r-v472-jgq9"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-352"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-M68R-V472-JGQ9

Vulnerability from github – Published: 2026-05-05 18:10 – Updated: 2026-06-08 23:20

Summary

JupyterHub has cross-origin form POSTs bypass XSRF (CWE-352)

Details

Summary

JupyterHub's XSRF protection (updated in 4.1.0) inappropriately treated requests with Sec-Fetch-Mode: no-cors as same-origin requests, which they are not, 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 share access to their server, cause a user to accept a share and have access to the attacker's server.

Patches

Upgrade to JupyterHub 5.4.5.

Mitigations

If a reverse proxy is in use, drop requests to JupyterHub with Sec-Fetch-Mode: no-cors.

Severity

5.4 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "jupyterhub"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.1.0"
            },
            {
              "fixed": "5.4.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40864"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-352"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-05T18:10:58Z",
    "nvd_published_at": "2026-05-22T21:16:43Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nJupyterHub\u0027s XSRF protection (updated in 4.1.0) inappropriately treated requests with `Sec-Fetch-Mode: no-cors` as same-origin requests, which they are not, 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 share access to their server, cause a user to accept a share and have access to the attacker\u0027s server.\n\n## Patches\n\nUpgrade to JupyterHub 5.4.5.\n\n## Mitigations\n\nIf a reverse proxy is in use, drop requests to JupyterHub with `Sec-Fetch-Mode: no-cors`.",
  "id": "GHSA-m68r-v472-jgq9",
  "modified": "2026-06-08T23:20:50Z",
  "published": "2026-05-05T18:10:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-m68r-v472-jgq9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40864"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jupyterhub/jupyterhub/commit/9c5ec277d3cda5a59de2d8c8117efa77bd941127"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/jupyterhub/jupyterhub"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "JupyterHub has cross-origin form POSTs bypass XSRF (CWE-352)"
}

PYSEC-2026-2189

Vulnerability from pysec - Published: 2026-05-22 21:16 - Updated: 2026-07-13 05:49

Details

Severity

4.3 (Medium)


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

Impacted products

Name	purl
jupyterhub	pkg:pypi/jupyterhub

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "jupyterhub",
        "purl": "pkg:pypi/jupyterhub"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.1.0"
            },
            {
              "fixed": "5.4.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.1.0",
        "4.1.1",
        "4.1.2",
        "4.1.3",
        "4.1.4",
        "4.1.5",
        "4.1.6",
        "5.0.0",
        "5.0.0b1",
        "5.0.0b2",
        "5.1.0",
        "5.2.0",
        "5.2.1",
        "5.3.0",
        "5.3.0rc0",
        "5.4.0",
        "5.4.1",
        "5.4.2",
        "5.4.3",
        "5.4.4"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40864",
    "GHSA-m68r-v472-jgq9"
  ],
  "details": "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 share access to their server, cause a user to accept a share and have access to the attacker\u0027s server. This issue has been fixed in version 5.4.5. If developers are unable to immediately upgrade, they can temporarily mitigate this issue by dropping requests to JupyterHub with Sec-Fetch-Mode: no-cors if they are using a reverse proxy.",
  "id": "PYSEC-2026-2189",
  "modified": "2026-07-13T05:49:17.323314Z",
  "published": "2026-05-22T21:16:43.177Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-m68r-v472-jgq9"
    },
    {
      "type": "FIX",
      "url": "https://github.com/jupyterhub/jupyterhub/commit/9c5ec277d3cda5a59de2d8c8117efa77bd941127"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

ubuntu-cve-2026-40864

Vulnerability from osv_ubuntu

Published

2026-05-22 21:16

Modified

2026-06-03 05:56

Summary

Details

Severity

5.4 (Medium)


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

4.3 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-40864	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-40864	REPORT
	https://github.com/jupyterhub/jupyterhub/security…	REPORT
	https://github.com/jupyterhub/jupyterhub/commit/9…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "jupyterhub",
            "binary_version": "2.0.0+ds1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "jupyterhub",
        "purl": "pkg:deb/ubuntu/jupyterhub@2.0.0+ds1-2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.0+ds1-1",
        "2.0.0+ds1-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "jupyterhub",
            "binary_version": "3.0.0+ds1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "jupyterhub",
        "purl": "pkg:deb/ubuntu/jupyterhub@3.0.0+ds1-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.0+ds1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "jupyterhub",
            "binary_version": "5.2.1+ds1-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "jupyterhub",
        "purl": "pkg:deb/ubuntu/jupyterhub@5.2.1+ds1-4?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.2.1+ds1-2",
        "5.2.1+ds1-3",
        "5.2.1+ds1-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "jupyterhub",
            "binary_version": "5.2.1+ds1-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "jupyterhub",
        "purl": "pkg:deb/ubuntu/jupyterhub@5.2.1+ds1-4?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.2.1+ds1-4"
      ]
    }
  ],
  "aliases": [],
  "details": "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 share access to their server, cause a user to accept a share and have access to the attacker\u0027s server. This issue has been fixed in version 5.4.5. If developers are unable to immediately upgrade, they can temporarily mitigate this issue by dropping requests to JupyterHub with Sec-Fetch-Mode: no-cors if they are using a reverse proxy.",
  "id": "UBUNTU-CVE-2026-40864",
  "modified": "2026-06-03T05:56:04Z",
  "published": "2026-05-22T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-40864"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-40864"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-m68r-v472-jgq9"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jupyterhub/jupyterhub/commit/9c5ec277d3cda5a59de2d8c8117efa77bd941127"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-40864"
  ]
}

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

CVE-2026-40864 (GCVE-0-2026-40864)

bit-jupyterhub-2026-40864

Vulnerability from bitnami_vulndb

FKIE_CVE-2026-40864

GHSA-M68R-V472-JGQ9

Summary

Patches

Mitigations

PYSEC-2026-2189

ubuntu-cve-2026-40864

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature