CVE-2015-4707 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in ipython. A fix is available for ipython — see the affected versions and patch details below.
Improper Neutralization of Input During Web Page Generation in IPython
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
ipythonReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Cross-site scripting (XSS) vulnerability in IPython before 3.2 allows remote attackers to inject arbitrary web script or HTML via vectors involving JSON error messages and the /api/notebooks path.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | ipython | all versions | 3.2.0pip install --upgrade 'ipython==3.2.0' |
Affected Products
ipythonipythonDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ipython, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update ipython to 3.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2015-4707 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
Frequently Asked Questions
Is CVE-2015-4707 in your dependencies?
Find it across PyPI, including transitive dependencies.