Arbitrary SQL Execution Vulnerability in YetAnotherForum.NET by YAF.NET
CVE-2026-43937

8.8HIGH

Key Information:

Vendor

Yafnet

Status
Yafnet
Vendor
CVE Published:
12 May 2026

What is CVE-2026-43937?

A vulnerability in YetAnotherForum.NET allows low-privileged users to execute arbitrary SQL commands through the /Admin/RunSql endpoint. The problem arises from insufficient validation of user inputs, specifically in the OnPostRunQuery handler, which indiscriminately binds data from the request body to the database execution method without appropriate checks. This issue has been addressed in version 4.0.5, highlighting the importance of applying updates to secure the forum environment against potential attacks.

Affected Version(s)

YAFNET < 4.0.5

References

https://github.com/YAFNET/YAFNET/security/advisories/GHSA...
x_refsource_CONFIRM

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.