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...

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 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: 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...

GHSA-FCW5-X6J4-CCMP Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP

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 non-sanitizing behavior, a notebook carrying an HTML payload in a displaydata outpu...

Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP

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 non-sanitizing behavior, a notebook carrying an HTML payload in a displaydata outpu...

Improper Restriction of Rendered UI Layers or Frames

Overview Affected versions of this package are vulnerable to Improper Restriction of Rendered UI Layers or Frames via the NbconvertFileHandler and NbconvertPostHandler classes when rendering user-authored notebook HTML without a proper sandbox directive in the Content-Security-Policy. An attacker...

PT-2026-50718

Name of the Vulnerable Software and Affected Versions jupyter-server versions prior to 2.20.0 Description The nbconvert HTTP handlers render user-authored notebook HTML under the Jupyter origin without a sandbox directive in their Content-Security-Policy CSP, which is a security layer that helps...

OPENSUSE-SU-2026:10972-1 python311-jupyter-server-2.19.0-1.1 on GA media

These are all security issues fixed in the python311-jupyter-server-2.19.0-1.1 package on the GA media of openSUSE Tumbleweed...

CVE-2026-35397

Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, a path traversal vulnerability in the REST API allows an authenticated user to escape the configured rootdir and access sibling directories whose names begin with the same prefix as the rootdir. For exampl...

CVE-2026-6657

A flaw was found in jupyter-server. A remote attacker can bypass Cross-Origin Resource Sharing CORS origin validation when the alloworiginpat configuration is used. This vulnerability allows malicious domains to pass validation against patterns intended for trusted domains. This could lead to...

SUSE CVE-2026-6657

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...

CVE-2026-40934

A flaw was found in Jupyter Server. The secret used to sign authentication cookies is not rotated when a user changes their password, allowing previously issued authentication cookies to remain valid. A remote attacker who has captured a session cookie can retain full authenticated access to the...

CVE-2026-6657

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...