Incorrect Behavior Order Affecting horizon package, versions [25.6.0,25.7.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-HORIZON-16635044
- published11 May 2026
- disclosed5 May 2026
- creditErichen
Introduced: 5 May 2026
NewCVE-2026-43002 (opens in a new tab)How to fix?
Upgrade horizon to version 25.7.3 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Behavior Order due to a write operation to the session storage backend occurring before authentication. An attacker can exhaust storage resources by sending unauthenticated requests.