PYSEC-2026-3472 jupyter-server is vulnerable to CORS origin validation bypass when the `allow_origin_pat` configuration is used

A vulnerability in jupyter-server versions 1.12.0 through 2.17.0 allows an attacker to bypass CORS origin validation when the alloworiginpat configuration is used. The issue arises from the use of re.match for validating the Origin header, which only anchors at the start of the string. This allow...

PYSEC-2026-2532 Jupyter Server vulnerable to Path Traversal via incorrect root directory boundary check in _get_os_path()

A path traversal vulnerability exists in jupyter-server version 2.17.0 due to an incorrect root directory boundary check in the getospath function within jupyterserver/services/contents/fileio.py. The check uses startswithroot without appending a trailing path separator, allowing sibling...

PYSEC-2026-2534 JupyterLab vulnerable to potential authentication and CSRF tokens leak

Impact Users of JupyterLab who click on a malicious link may get their Authorization and XSRFToken tokens exposed to a third party when running an older jupyter-server version. Patches JupyterLab 4.1.0b2, 4.0.11, and 3.6.7 were patched. Workarounds No workaround has been identified, however users...

PYSEC-2026-1706 JupyterLab vulnerable to potential authentication and CSRF tokens leak

Impact Users of JupyterLab who click on a malicious link may get their Authorization and XSRFToken tokens exposed to a third party when running an older jupyter-server version. Patches JupyterLab 4.1.0b2, 4.0.11, and 3.6.7 were patched. Workarounds No workaround has been identified, however users...

Fedora 43 : python-jupyter-server (2026-275d2ecbbd)

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-275d2ecbbd advisory. New version fixing high-severity CVE. Tenable has extracted the preceding description block directly from the Fedora security advisory. Note that Nessus has...

[SECURITY] Fedora 44 Update: python-jupyter-server-2.20.0-1.fc44

The Jupyter Server provides the backend i.e. the core services, APIs, and REST endpoints for Jupyter web applications like Jupyter notebook, JupyterLab, and Voila...

[SECURITY] Fedora 43 Update: python-jupyter-server-2.20.0-1.fc43

The Jupyter Server provides the backend i.e. the core services, APIs, and REST endpoints for Jupyter web applications like Jupyter notebook, JupyterLab, and Voila...

OPENSUSE-SU-2026:11159-1 python311-jupyter-server-2.20.0-1.1 on GA media

These are all security issues fixed in the python311-jupyter-server-2.20.0-1.1 package on the GA media of openSUSE Tumbleweed...

CVE-2026-44727

A flaw was found in Jupyter Server. The nbconvert HTTP handlers in Jupyter Server render user-authored notebook HTML without a sandbox directive in their Content-Security-Policy. This, combined with nbconvert.HTMLExporter's default non-sanitizing behavior, allows a notebook containing an HTML...

[SECURITY] Fedora 43 Update: python-jupyter-server-2.19.0-2.fc43

The Jupyter Server provides the backend i.e. the core services, APIs, and REST endpoints for Jupyter web applications like Jupyter notebook, JupyterLab, and Voila...

CVE-2026-6658 Cross-site Scripting (XSS) in jupyter/nbconvert

A vulnerability in jupyter/nbconvert versions tag. This vulnerability impacts any server using nbconvert to render notebooks as HTML, allowing attackers to execute arbitrary JavaScript in the context of users viewing the HTML export...

Fedora 43 : python-jupyter-server (2026-9536c7cb79)

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-9536c7cb79 advisory. New version of jupyter-server fixing various security vulnerabilities. Tenable has extracted the preceding description block directly from the Fedor...

Linux Distros Unpatched Vulnerability : CVE-2026-44727

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in jupyterserver render user-authored notebook HTML under...

CVE-2026-44727

Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in jupyterserver render user-authored notebook HTML under the Jupyter origin without a sandbox directive in their Content-Security-Policy. Combined with nbconvert.HTMLExporter's default...

DEBIAN-CVE-2026-44727

Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in jupyterserver render user-authored notebook HTML under the Jupyter origin without a sandbox directive in their Content-Security-Policy. Combined with nbconvert.HTMLExporter's default...

CVE-2026-44727 Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP

Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in jupyterserver render user-authored notebook HTML under the Jupyter origin without a sandbox directive in their Content-Security-Policy. Combined with nbconvert.HTMLExporter's default...

CVE-2026-44727

Jupyter Server (prior to 2.20) is affected by a stored XSS in the nbconvert HTML export path. The nbconvert HTTP handlers NbconvertFileHandler and NbconvertPostHandler render notebook HTML under the Jupyter origin without a sandbox directive in Content-Security-Policy, and NbconvertHTMLExporter’s...

CVE-2026-44727

Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in jupyterserver render user-authored notebook HTML under the Jupyter origin without a sandbox directive in their Content-Security-Policy. Combined with nbconvert.HTMLExporter's default...

CVE-2026-44727 Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP

Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in jupyterserver render user-authored notebook HTML under the Jupyter origin without a sandbox directive in their Content-Security-Policy. Combined with nbconvert.HTMLExporter's default...

CVE-2026-44727 Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP

Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in jupyterserver render user-authored notebook HTML under the Jupyter origin without a sandbox directive in their Content-Security-Policy. Combined with nbconvert.HTMLExporter's default...