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CVE-2026-43937— YAF.NET: Pre-Handler Authorization Bypass on Admin Pages Enabling Blind SQL Execution via `/Admin/RunSql`

Quick assessment

Affected
YAFNET YAFNET
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

YAFNET是YAFNET个人开发者的ASP.NET 开源论坛解决方案。 YAFNET 4.0.5之前版本存在SQL注入漏洞，该漏洞源于管理员OnPost处理程序在执行副作用后才重定向响应，可能导致低权限用户执行任意SQL。

CVSS 8.8 · High EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
YAFNET YAFNET < 4.0.5 affected
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I. Basic Information for CVE-2026-43937

Vulnerability Information
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Vulnerability Title
YAF.NET: Pre-Handler Authorization Bypass on Admin Pages Enabling Blind SQL Execution via `/Admin/RunSql`
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
SQL命令中使用的特殊元素转义处理不恰当(SQL注入)
Source: CVE Program / CVE List V5
Vulnerability Title
YAFNET SQL注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
YAFNET是YAFNET个人开发者的ASP.NET 开源论坛解决方案。 YAFNET 4.0.5之前版本存在SQL注入漏洞，该漏洞源于管理员OnPost处理程序在执行副作用后才重定向响应，可能导致低权限用户执行任意SQL。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
YAFNET YAFNET < 4.0.5 -

II. Public POCs for CVE-2026-43937

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III. Intelligence Information for CVE-2026-43937

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Vendor Advisories for CVE-2026-43937 (1)

Same Patch Batch · YAFNET · 2026-05-12 · 3 CVEs total

CVE-2026-43938 8.1 HIGH YAF.NET: Unauthenticated Stored Second-Order XSS in Admin Event Log via Reflected `User-Ag
CVE-2026-43939 7.3 HIGH YAF.NET: Stored XSS in Forum Thread Posts/Replies Allowing Arbitrary JavaScript Execution

IV. Related Vulnerabilities

Same product: YAFNET
Same vendor: YAFNET
Same weakness: CWE-89

V. Comments for CVE-2026-43937

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