CVE-2026-43937Public exploitNetwork attack vector

Authenticated SQL execution via post-handler authorization check

Published May 12, 2026 · Updated May 12, 2026

SQL injection in YAF.NET before 4.0.5 allows remote authenticated users to execute arbitrary SQL through the /Admin/RunSql endpoint. PageSecurityCheckAttribute runs after page handlers finish, so OnPostRunQuery passes the bound Editor value directly to IDbAccess.RunSql before access is denied. A registered low-privileged account can read or alter application data through blind queries and interrupt the service; self-registration broadens exposure.

CVSS severity8.8
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in YAF.NET before 4.0.5 allows remote authenticated users to execute arbitrary SQL through the /Admin/RunSql endpoint. PageSecurityCheckAttribute runs after page handlers finish, so OnPostRunQuery passes the bound Editor value directly to IDbAccess.RunSql before access is denied. A registered low-privileged account can read or alter application data through blind queries and interrupt the service; self-registration broadens exposure.

The record

CVE
CVE-2026-43937
Published
May 12, 2026
Updated
May 12, 2026
Vendor
YetAnotherForum.NET
Product
YAF.NET
Classifications
CWE-89, CWE-841, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

YetAnotherForum.NET · YAF.NETversion=< 4.0.5

Published CVSS scores

8.8GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CWE-841Improper Enforcement of Behavioral Workflow
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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