PULSE
LIVE15signals / 24h
ES
FEED
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CVE WatchJul 15, 2026

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

Medium

EPSS

0.2%

p13

KEV

—

Exploit Today

4

0-100

Published: Jun 22, 2026 · Last modified: Jul 15, 2026 · CWE-79 · CWE-1021

EPSS · 30d
0.2%EPSS · 30 days0.2%
2026-06-302026-07-17
Technical description

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.

Official references
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