# Jupyter-Server vulnerabilities Source: https://junglewise.ai/threats/technologies/jupyter-server Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/jupyter-server.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 9 vulnerabilities in Jupyter-Server: 0 in the last 7 days and 1 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-114135, was published on 21 October 2026. 1 vulnerability in the last four weeks, up from none in the four before. ## Counts - Last 7 days: 0 - Last 30 days: 1 - Last 90 days: 1 - All time: 9 (1 critical, 0 exploited in the wild) ## About Jupyter-Server Backend server that provides a web-based interface for Jupyter notebooks. ## Latest Jupyter-Server vulnerabilities - [CVE-2026-114135: Jupyter Server authorization bypass in kernel gateway handlers](https://junglewise.ai/threats/cve-2026-114135-jupyter-server-is-the-backend-for-jupyter-web-applications-from) (high, CVSS 8.8, published 21 Oct 2026) - [CVE-2026-44727: Jupyter Server stored XSS in nbconvert handlers](https://junglewise.ai/threats/cve-2026-44727-jupyter-server-stored-xss-in-nbconvert-handlers) (critical, CVSS 4, published 22 Jun 2026) - [CVE-2026-6657: Jupyter Jupyter Server CORS bypass via improper origin validation](https://junglewise.ai/threats/cve-2026-6657-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation) (medium, CVSS 6.1, published 3 Jun 2026) - [CVE-2026-5422: Jupyter jupyter-server path traversal in _get_os_path](https://junglewise.ai/threats/cve-2026-5422-jupyter-jupyter-server-path-traversal-in-get-os-path) (medium, CVSS 6.8, published 2 Jun 2026) - [CVE-2026-40934: Jupyter Server insufficient session expiration after password reset](https://junglewise.ai/threats/cve-2026-40934-jupyter-server-insufficient-session-expiration-after-password) (medium, CVSS 6.8, published 5 May 2026) - [CVE-2026-40110: Jupyter Jupyter Server CORS bypass via improper Origin validation](https://junglewise.ai/threats/cve-2026-40110-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation) (high, CVSS 7.3, published 5 May 2026) - [CVE-2026-35397: Jupyter Server path traversal in REST API](https://junglewise.ai/threats/cve-2026-35397-jupyter-server-path-traversal-in-rest-api) (high, CVSS 8.8, published 5 May 2026) - [CVE-2025-61669: Jupyter Server open redirect in LoginFormHandler via next parameter](https://junglewise.ai/threats/cve-2025-61669-jupyter-server-open-redirect-in-loginformhandler-via-next) (medium, CVSS 6.1, published 5 May 2026) - [CVE-2020-26275: Jupyter Server open redirect vulnerability](https://junglewise.ai/threats/cve-2020-26275-jupyter-server-open-redirect-vulnerability) (medium, CVSS 6.1, published 21 Dec 2020) ## Most severe Jupyter-Server vulnerabilities - [CVE-2026-44727: Jupyter Server stored XSS in nbconvert handlers](https://junglewise.ai/threats/cve-2026-44727-jupyter-server-stored-xss-in-nbconvert-handlers) (critical, CVSS 4, published 22 Jun 2026) - [CVE-2026-35397: Jupyter Server path traversal in REST API](https://junglewise.ai/threats/cve-2026-35397-jupyter-server-path-traversal-in-rest-api) (high, CVSS 8.8, published 5 May 2026) - [CVE-2026-114135: Jupyter Server authorization bypass in kernel gateway handlers](https://junglewise.ai/threats/cve-2026-114135-jupyter-server-is-the-backend-for-jupyter-web-applications-from) (high, CVSS 8.8, published 21 Oct 2026) - [CVE-2026-40110: Jupyter Jupyter Server CORS bypass via improper Origin validation](https://junglewise.ai/threats/cve-2026-40110-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation) (high, CVSS 7.3, published 5 May 2026) - [CVE-2026-5422: Jupyter jupyter-server path traversal in _get_os_path](https://junglewise.ai/threats/cve-2026-5422-jupyter-jupyter-server-path-traversal-in-get-os-path) (medium, CVSS 6.8, published 2 Jun 2026) - [CVE-2026-40934: Jupyter Server insufficient session expiration after password reset](https://junglewise.ai/threats/cve-2026-40934-jupyter-server-insufficient-session-expiration-after-password) (medium, CVSS 6.8, published 5 May 2026) - [CVE-2020-26275: Jupyter Server open redirect vulnerability](https://junglewise.ai/threats/cve-2020-26275-jupyter-server-open-redirect-vulnerability) (medium, CVSS 6.1, published 21 Dec 2020) - [CVE-2026-6657: Jupyter Jupyter Server CORS bypass via improper origin validation](https://junglewise.ai/threats/cve-2026-6657-jupyter-jupyter-server-cors-bypass-via-improper-origin-validation) (medium, CVSS 6.1, published 3 Jun 2026) - [CVE-2025-61669: Jupyter Server open redirect in LoginFormHandler via next parameter](https://junglewise.ai/threats/cve-2025-61669-jupyter-server-open-redirect-in-loginformhandler-via-next) (medium, CVSS 6.1, published 5 May 2026) ## Vulnerabilities per week 1 vulnerability in the last four weeks, up from none in the four before. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 1 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other Jupyter technologies - [Jupyter Nbconvert](https://junglewise.ai/threats/technologies/jupyter-nbconvert): 4 vulnerabilities - [Jupyter Enterprise Gateway](https://junglewise.ai/threats/technologies/enterprise-gateway): 3 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Jupyter-Server vulnerabilities", https://junglewise.ai/threats/technologies/jupyter-server, 9 November 2026.