{"schema_version":1,"title":"Jupyter-Server vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 8 vulnerabilities in Jupyter-Server: 0 in the last 7 days and 0 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-44727, was published on 22 June 2026.","url":"https://junglewise.ai/threats/technologies/jupyter-server","json_url":"https://junglewise.ai/threats/technologies/jupyter-server.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/technologies/jupyter-server","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"technology","counts":{"high":2,"all_time":8,"critical":1,"exploited":0,"last_7_days":0,"last_30_days":0,"last_90_days":0,"last_365_days":7},"latest":[{"cve":"CVE-2026-44727","cvss":4,"epss":0.0044,"slug":"cve-2026-44727-jupyter-server-stored-xss-in-nbconvert-handlers","title":"Jupyter Server stored XSS in nbconvert handlers","severity":"critical","exploited":false,"published_at":"2026-06-22T21:16:24.26+00:00","url":"https://junglewise.ai/threats/cve-2026-44727-jupyter-server-stored-xss-in-nbconvert-handlers"},{"cve":"CVE-2026-6657","cvss":6.1,"epss":0.0027,"slug":"cve-2026-6657-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation","title":"Jupyter Jupyter Server CORS bypass via improper origin validation","severity":"medium","exploited":false,"published_at":"2026-06-03T16:16:31.71+00:00","url":"https://junglewise.ai/threats/cve-2026-6657-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation"},{"cve":"CVE-2026-5422","cvss":6.8,"epss":0.0055,"slug":"cve-2026-5422-jupyter-jupyter-server-path-traversal-in-get-os-path","title":"Jupyter jupyter-server path traversal in _get_os_path","severity":"medium","exploited":false,"published_at":"2026-06-02T10:16:25.8+00:00","url":"https://junglewise.ai/threats/cve-2026-5422-jupyter-jupyter-server-path-traversal-in-get-os-path"},{"cve":"CVE-2026-40934","cvss":6.8,"epss":0.0038,"slug":"cve-2026-40934-jupyter-server-insufficient-session-expiration-after-password","title":"Jupyter Server insufficient session expiration after password reset","severity":"medium","exploited":false,"published_at":"2026-05-05T22:16:00.82+00:00","url":"https://junglewise.ai/threats/cve-2026-40934-jupyter-server-insufficient-session-expiration-after-password"},{"cve":"CVE-2026-40110","cvss":7.3,"epss":0.0047,"slug":"cve-2026-40110-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation","title":"Jupyter Jupyter Server CORS bypass via improper Origin validation","severity":"high","exploited":false,"published_at":"2026-05-05T22:16:00.663+00:00","url":"https://junglewise.ai/threats/cve-2026-40110-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation"},{"cve":"CVE-2026-35397","cvss":8.8,"epss":0.0067,"slug":"cve-2026-35397-jupyter-server-path-traversal-in-rest-api","title":"Jupyter Server path traversal in REST API","severity":"high","exploited":false,"published_at":"2026-05-05T20:16:38.223+00:00","url":"https://junglewise.ai/threats/cve-2026-35397-jupyter-server-path-traversal-in-rest-api"},{"cve":"CVE-2025-61669","cvss":6.1,"epss":0.0027,"slug":"cve-2025-61669-jupyter-server-open-redirect-in-loginformhandler-via-next","title":"Jupyter Server open redirect in LoginFormHandler via next parameter","severity":"medium","exploited":false,"published_at":"2026-05-05T16:16:10.133+00:00","url":"https://junglewise.ai/threats/cve-2025-61669-jupyter-server-open-redirect-in-loginformhandler-via-next"},{"cve":"CVE-2020-26275","cvss":6.1,"epss":0.0138,"slug":"cve-2020-26275-jupyter-server-open-redirect-vulnerability","title":"Jupyter Server open redirect vulnerability","severity":"medium","exploited":false,"published_at":"2020-12-21T18:01:41+00:00","url":"https://junglewise.ai/threats/cve-2020-26275-jupyter-server-open-redirect-vulnerability"}],"weekly":[{"week":"2026-06-29","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-06","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-13","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-20","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-27","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-03","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-10","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-21","critical":0,"exploited":0,"vulnerabilities":0}],"related":[{"name":"Jupyter Enterprise Gateway","slug":"enterprise-gateway","vulnerabilities":3,"url":"https://junglewise.ai/threats/technologies/enterprise-gateway"}],"technology":{"hub":true,"name":"Jupyter-Server","slug":"jupyter-server","vendor":{"name":"Jupyter","slug":"jupyter","url":"https://junglewise.ai/threats/vendors/jupyter"},"aliases":[],"category":"web-server","homepage":"https://jupyter.org/","repo_url":"https://github.com/jupyter-server/jupyter_server","description":"The backend for Jupyter web applications that provides the core services, APIs, and REST endpoints for notebooks.","url":"https://junglewise.ai/threats/technologies/jupyter-server"},"most_severe":[{"cve":"CVE-2026-44727","cvss":4,"epss":0.0044,"slug":"cve-2026-44727-jupyter-server-stored-xss-in-nbconvert-handlers","title":"Jupyter Server stored XSS in nbconvert handlers","severity":"critical","exploited":false,"published_at":"2026-06-22T21:16:24.26+00:00","url":"https://junglewise.ai/threats/cve-2026-44727-jupyter-server-stored-xss-in-nbconvert-handlers"},{"cve":"CVE-2026-35397","cvss":8.8,"epss":0.0067,"slug":"cve-2026-35397-jupyter-server-path-traversal-in-rest-api","title":"Jupyter Server path traversal in REST API","severity":"high","exploited":false,"published_at":"2026-05-05T20:16:38.223+00:00","url":"https://junglewise.ai/threats/cve-2026-35397-jupyter-server-path-traversal-in-rest-api"},{"cve":"CVE-2026-40110","cvss":7.3,"epss":0.0047,"slug":"cve-2026-40110-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation","title":"Jupyter Jupyter Server CORS bypass via improper Origin validation","severity":"high","exploited":false,"published_at":"2026-05-05T22:16:00.663+00:00","url":"https://junglewise.ai/threats/cve-2026-40110-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation"},{"cve":"CVE-2026-5422","cvss":6.8,"epss":0.0055,"slug":"cve-2026-5422-jupyter-jupyter-server-path-traversal-in-get-os-path","title":"Jupyter jupyter-server path traversal in _get_os_path","severity":"medium","exploited":false,"published_at":"2026-06-02T10:16:25.8+00:00","url":"https://junglewise.ai/threats/cve-2026-5422-jupyter-jupyter-server-path-traversal-in-get-os-path"},{"cve":"CVE-2026-40934","cvss":6.8,"epss":0.0038,"slug":"cve-2026-40934-jupyter-server-insufficient-session-expiration-after-password","title":"Jupyter Server insufficient session expiration after password reset","severity":"medium","exploited":false,"published_at":"2026-05-05T22:16:00.82+00:00","url":"https://junglewise.ai/threats/cve-2026-40934-jupyter-server-insufficient-session-expiration-after-password"},{"cve":"CVE-2020-26275","cvss":6.1,"epss":0.0138,"slug":"cve-2020-26275-jupyter-server-open-redirect-vulnerability","title":"Jupyter Server open redirect vulnerability","severity":"medium","exploited":false,"published_at":"2020-12-21T18:01:41+00:00","url":"https://junglewise.ai/threats/cve-2020-26275-jupyter-server-open-redirect-vulnerability"},{"cve":"CVE-2026-6657","cvss":6.1,"epss":0.0027,"slug":"cve-2026-6657-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation","title":"Jupyter Jupyter Server CORS bypass via improper origin validation","severity":"medium","exploited":false,"published_at":"2026-06-03T16:16:31.71+00:00","url":"https://junglewise.ai/threats/cve-2026-6657-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation"},{"cve":"CVE-2025-61669","cvss":6.1,"epss":0.0027,"slug":"cve-2025-61669-jupyter-server-open-redirect-in-loginformhandler-via-next","title":"Jupyter Server open redirect in LoginFormHandler via next parameter","severity":"medium","exploited":false,"published_at":"2026-05-05T16:16:10.133+00:00","url":"https://junglewise.ai/threats/cve-2025-61669-jupyter-server-open-redirect-in-loginformhandler-via-next"}],"generated_at":"2026-09-26T13:07:00.120236+00:00"}