Authorization Bypass Through User-Controlled Key Affecting avo package, versions <3.31.1
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Authorization Bypass Through User-Controlled Key vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-RUBY-AVO-16301597
- published27 Apr 2026
- disclosed19 Apr 2026
- creditIllunight
Introduced: 19 Apr 2026
CVE-2026-42205 (opens in a new tab)How to fix?
Upgrade avo to version 3.31.1 or higher.
Overview
Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key in the action_class() function in the ActionsController. A user can gain unauthorized access to sensitive actions and escalate privileges by invoking unregistered action classes on arbitrary resources (every member of Avo::BaseAction.descendants), even if the actions is not registered for that resource.