Description
YetAnotherForum.NET (YAF.NET) is a C# ASP.NET forum. Prior to 4.0.5 and 3.2.12, the application's database logger (YAFNET.Core/Logger/DbLogger.cs) captures the incoming request's User-Agent header into a JObject, serializes it with JsonConvert, and stores the result in the EventLog.Description column whenever an event (e.g., an unhandled exception) is logged. The admin event-log page (YetAnotherForum.NET/Pages/Admin/EventLog.cshtml.cs) later deserializes that JSON in FormatStackTrace() and interpolates the UserAgent value directly into an HTML string with no encoding, and the Razor view EventLog.cshtml emits the result through @Html.Raw. This vulnerability is fixed in 4.0.5 and 3.2.12.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| YAFNET | YAFNET | >= 4.0.0-beta.1, < 4.0.5, < 3.2.12 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| NuGet | YAFNET.Core | >= 4.0.0-beta01, < 4.0.5 | 4.0.5 | GHSA-33gv-fc78-qgf5 |
| NuGet | YAFNET.Core | < 3.2.12 | 3.2.12 | GHSA-33gv-fc78-qgf5 |