Improper Enforcement of Behavioral Workflow Affecting yafnet.core package, versions [,4.0.5)
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 Improper Enforcement of Behavioral Workflow vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-DOTNET-YAFNETCORE-16638645
- published11 May 2026
- disclosed5 May 2026
- creditMuhammadUwais
Introduced: 5 May 2026
CVE-2026-43937 (opens in a new tab)How to fix?
Upgrade YAFNET.Core to version 4.0.5 or higher.
Overview
YAFNET.Core is an Open Source Forum solution! The YAF.NET project is an international collaboration of like-minded, skilled, and creative individuals who are striving to make YAF.NET the most robust and malleable forum solutions available.
Affected versions of this package are vulnerable to Improper Enforcement of Behavioral Workflow through the PageSecurityCheckAttribute in the YAF.Core.Filters component. An attacker can access protected forum pages by sending requests that bypass the intended security checks and reach the page handlers. This allows unauthenticated or insufficiently privileged users to view restricted pages such as member lists, profiles, search, and admin-only pages, exposing forum content and administrative functionality to users who should not have access.