High severity8.8NVD Advisory· Published May 12, 2026· Updated May 13, 2026
CVE-2026-43937
CVE-2026-43937
Description
YetAnotherForum.NET (YAF.NET) is a C# ASP.NET forum. Prior to 4.0.5, Any admin OnPost… handler executes its side effects before the ResultFilterAttribute rewrites the response to a 302 to /Info/4. The most impactful abuse is /Admin/RunSql, whose OnPostRunQuery binds Editor from the POST body and passes it straight to IDbAccess.RunSql with no caller check, yielding arbitrary SQL execution for any low-privileged user. This vulnerability is fixed in 4.0.5.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
YAFNET.CoreNuGet | < 4.0.5 | 4.0.5 |
Affected products
1Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-xhw7-j96h-c3g5ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-43937ghsaADVISORY
- github.com/YAFNET/YAFNET/commit/27f7e671f93698f7e014d5d0fb88320248b8aa20ghsaWEB
- github.com/YAFNET/YAFNET/releases/tag/v4.0.5ghsaWEB
- github.com/YAFNET/YAFNET/security/advisories/GHSA-xhw7-j96h-c3g5nvdWEB
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