Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| jupyter-server | jupyter_server | affected |
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No data.
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| Jupyter | Jupyter Server |
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| Source | ID | Title |
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Github GHSA |
GHSA-fcw5-x6j4-ccmp | Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP |
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.438% probability within 30 days)
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threat_severity
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cvssV3_1
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| First Time appeared |
Jupyter
Jupyter jupyter Server |
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Jupyter
Jupyter jupyter Server |
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ssvc
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| 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. | |
| Title | Jupyter Server: Stored XSS in `NbconvertFileHandler` / `NbconvertPostHandler` via missing `sandbox` CSP | |
| Weaknesses | CWE-1021 CWE-79 |
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| Metrics |
cvssV4_0
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