# CVE-2026-43937

## Summary

- **CVE ID:** CVE-2026-43937
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-89, CWE-841
- **Published:** May 12, 2026
- **Last Modified:** May 12, 2026

## 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.

## Affected Products

- YAFNET — YAFNET (< 4.0.5)

## References

- [CNA](https://github.com/YAFNET/YAFNET/security/advisories/GHSA-xhw7-j96h-c3g5)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.49%
- **EPSS Percentile:** 40.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-12._