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CVE-2026-44727
MEDIUM(5.4)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Risk Signal Score14/100 — NIEDRIG
- CVSS 5.4 — Mittel
EPSS-Score
0%
Exploit-Wahrscheinlichkeit (30 Tage)
CVSS Score
5.4
Technische Schwere
Beschreibung
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 Advisories
GHSA-fcw5-x6j4-ccmpCRITICAL
Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP
pip/jupyter-server→ 2.20.0
GitHub AdvisoryReferenzen
- https://github.com/jupyter-server/jupyter_server/commit/6cbee8d65e71abac851c4492...
- https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-fcw5-x...
- https://access.redhat.com/security/cve/CVE-2026-44727
- https://bugzilla.redhat.com/show_bug.cgi?id=2491516
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44727.json