# CVE-2017-7400: PYSEC-2026-821 - OpenStack Horizon Cross-site Scripting (XSS)

Source: https://junglewise.ai/threats/cve-2017-7400-openstack-horizon-cross-site-scripting-xss  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-06  
License: CC BY 4.0 with a link back

CVE-2017-7400 · Severity: low · CVSS 3 · Published 2026-07-06

OpenStack Horizon Cross-site Scripting (XSS)

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

## Quick answers

**Is CVE-2017-7400 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2017-7400 being exploited in the wild.

**How severe is CVE-2017-7400?** Low severity, with a CVSS score of 3, published 6 July 2026.

**Which products and versions are affected?** horizon (PyPI) ECOSYSTEM:introduced=9.0,fixed=9.1.2, ECOSYSTEM:introduced=9.0,fixed=9.1.2,introduced=10.0,fixed=10.0.3,introduced=11.0.0,fixed=11.0.1.

**Is there a fix for CVE-2017-7400?** Yes. horizon (PyPI): upgrade to 11.0.1, 9.1.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2017-7400?** Check whether you run horizon (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

- horizon (PyPI): upgrade to 11.0.1, 9.1.2 or later

  ```sh
  pip install "horizon>=11.0.1"
  ```


## Affected products

- horizon (PyPI) ECOSYSTEM:introduced=9.0,fixed=9.1.2, ECOSYSTEM:introduced=9.0,fixed=9.1.2,introduced=10.0,fixed=10.0.3,introduced=11.0.0,fixed=11.0.1

## Identifiers

- CVE-2017-7400
- GHSA-47vp-44v9-rhgq
- PYSEC-2026-821

## Related threats

- [PYSEC-2026-822 - OpenStack Dashboard (aka Horizon) vulnerable to Cross-site Scripting](https://junglewise.ai/threats/cve-2014-0157-openstack-dashboard-aka-horizon-vulnerable-to-cross-site-scripting)
- [PYSEC-2026-642 - Horizon-Orchestration Cross-site scripting (XSS) vulnerability through resource name](https://junglewise.ai/threats/cve-2014-3473-horizon-orchestration-cross-site-scripting-xss-vulnerability)
- [PYSEC-2026-644 - OpenStack Horizon Cross-site scripting (XSS) vulnerability](https://junglewise.ai/threats/cve-2014-3474-openstack-horizon-cross-site-scripting-xss-vulnerability)
- [PYSEC-2026-641 - OpenStack Dashboard (Horizon) Cross-site scripting (XSS) vulnerability in the Host Aggregates interface](https://junglewise.ai/threats/cve-2014-3594-openstack-dashboard-horizon-cross-site-scripting-xss-vulnerability)
- [PYSEC-2026-643 - OpenStack Dashboard (Horizon) Cross-site scripting (XSS) vulnerability](https://junglewise.ai/threats/cve-2016-4428-openstack-dashboard-horizon-cross-site-scripting-xss-vulnerability)