CVE-2026-43938

216.73.217.22

· Published 12/05/2026 15:16 · Modified 13/05/2026 18:24

Labels: CVE-2026-43938 2026-05-12 CVE-2026-43938 CWE-79 [email protected]

Essential information

Published: 12/05/2026 15:16
Modified: 13/05/2026 18:24
Author: —
Creator: —
CVSS: 8.1 HIGH (v3.1)
CISA KEV: No
CWE: —
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CVSS metrics

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.

NVD status

Status: Deferred — CVE has been recently published to the CVE List and has been received by the NVD.
Source: [email protected]
NVD: View on NVD

Affected products (CPE)

Product	CPE
yetanotherforum.net / yaf.net	`cpe:2.3:a:yetanotherforum.net:yaf.net:<3.2.12:::::::*`
yetanotherforum.net / yaf.net	`cpe:2.3:a:yetanotherforum.net:yaf.net:<4.0.5:::::::*`