# CVE-2016-10516: Pallets Werkzeug cross-site scripting vulnerability

Source: https://junglewise.ai/threats/cve-2016-10516-pallets-werkzeug-cross-site-scripting-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2017-10-23  
License: CC BY 4.0 with a link back

CVE-2016-10516 · Severity: low · CVSS 3 · Published 2017-10-23

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.

Technologies: [werkzeug (PyPI)](https://junglewise.ai/threats/technologies/werkzeug). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2016-10516 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2016-10516 being exploited in the wild.

**How severe is CVE-2016-10516?** Low severity, with a CVSS score of 3, published 23 October 2017.

**Which products and versions are affected?** werkzeug (PyPI) ECOSYSTEM:introduced=0,fixed=0.11.11.

**Is there a fix for CVE-2016-10516?** Yes. werkzeug (PyPI): upgrade to 0.11.11 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2016-10516?** Check whether you run werkzeug (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- werkzeug (PyPI): upgrade to 0.11.11 or later

  ```sh
  pip install "werkzeug>=0.11.11"
  ```


## Affected products

- werkzeug (PyPI) ECOSYSTEM:introduced=0,fixed=0.11.11

## Identifiers

- CVE-2016-10516
- GHSA-h2fp-xgx6-xh6f
- PYSEC-2017-43

## Related threats

- [Werkzeug path traversal via NUL device with NTFS ADS marker](https://junglewise.ai/threats/cve-2026-102598-werkzeug-is-a-comprehensive-wsgi-web-application-library-prior)
- [PYSEC-2026-2044 - Werkzeug safe_join() allows Windows special device names with compound extensions](https://junglewise.ai/threats/cve-2026-21860-werkzeug-safe-join-allows-windows-special-device-names-with)
- [PYSEC-2026-2045 - Werkzeug safe_join not safe on Windows](https://junglewise.ai/threats/cve-2024-49766-werkzeug-safe-join-not-safe-on-windows)
- [PYSEC-2026-2043 - Werkzeug debugger vulnerable to remote execution when interacting with attacker controlled domain](https://junglewise.ai/threats/cve-2024-34069-werkzeug-debugger-remote-code-execution-via-attacker-controlled)
- [PYSEC-2026-1065 - Pallets Werkzeug vulnerable to Path Traversal](https://junglewise.ai/threats/cve-2019-14322-pallets-werkzeug-vulnerable-to-path-traversal)