High severity7.3NVD Advisory· Published May 12, 2026· Updated May 13, 2026
CVE-2026-43939
CVE-2026-43939
Description
YetAnotherForum.NET (YAF.NET) is a C# ASP.NET forum. Prior to 4.0.5 and 3.2.12, the thread posting and reply feature accepts user-supplied content via a a post or reply that is stored server-side and later rendered back into the thread page without adequate HTML sanitization or contextual output encoding. This vulnerability is fixed in 4.0.5 and 3.2.12.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
YAFNET.CoreNuGet | >= 4.0.0-beta01, < 4.0.5 | 4.0.5 |
YAFNET.CoreNuGet | < 3.2.12 | 3.2.12 |
Affected products
1Patches
Vulnerability mechanics
References
5News mentions
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