CVE-2026-44727
Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in jupyter_server render user-authore
CVSS
5.4
Medio
EPSS
0.2%
p13
KEV
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Exploit Today
4
0-100
Publicado: 22 jun 2026 · Última mod.: 15 jul 2026 · CWE-79 · CWE-1021
0.2%EPSS · 30 días0.2%
2026-06-302026-07-17
Jupyter Server is the backend for Jupyter web applications. Prior to 2.20, the nbconvert HTTP handlers in jupyter_server 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 display_data output triggers stored XSS with cookie access, full /api/* authority, and kernel RCE. This vulnerability is fixed in 2.20.
- github.comhttps://github.com/jupyter-server/jupyter_server/commit/6cbee8d65e71abac851c4492fea987ad080580bd
- github.comhttps://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-fcw5-x6j4-ccmp
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2026-44727
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2491516
- security.access.redhat.comhttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44727.json
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