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MEDIUM severity

Pallets Werkzeug cross-site scripting vulnerabilityGHSA-h2fp-xgx6-xh6f

MEDIUMFix: pallets/werkzeug#1001

GHSA-h2fp-xgx6-xh6f is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in werkzeug. A fix is available for werkzeug — see the affected versions and patch details below.

Also known asCVE-2016-10516PYSEC-2017-43
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.0%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs81th percentile — riskier than 81% of all scored CVEsHighest risk
0.00%0.83%1.66%2.48%0.4%2.0%May 26Sep 26Nov 26

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

1 pkg affected
🐍werkzeug

Real-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 the render_full function in debug/tbtools.py in the debugger in Pallets Werkzeug before 0.11.11 (as used in Pallets Flask and other products) allows remote attackers to inject arbitrary web script or HTML via a field that contains an exception message.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIwerkzeugall versions0.11.11pip install --upgrade 'werkzeug==0.11.11'

Affected Products

1 product · 1 configurations
Application
werkzeugpalletsprojects
< 0.11.11
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for werkzeug, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update werkzeug to 0.11.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h2fp-xgx6-xh6f is resolved across your whole dependency graph.

  3. 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.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate
ProductFixed inAdvisory
Red Hat Satellite 6.6 for RHEL 7ansiblerole-foreman_scap_client-0:0.0.3-1.el7satRHSA-2019:3172

Frequently Asked Questions

Cross-site scripting (XSS) vulnerability in the render_full function in debug/tbtools.py in the debugger in Pallets Werkzeug before 0.11.11 (as used in Pallets Flask and other products) allows remote attackers to inject arbitrary web script or HTML via a field that contains an exception message.
O3 Security · Impact-Aware SCA

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Pallets Werkzeug cross-site scripting vulnerability