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CVE-2026-43939

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CVE-2026-43939

Published: May 12, 2026

Modified: May 13, 2026

PUBLISHED

CVSS v3.1

7.3

HIGH

Description

YetAnotherForum.NET (YAF.NET) is a C# ASP.NET forum. Prior to 4.0.5 and 3.2.12, the thread posting and reply feature accepts user-supplied content via a a post or reply that is stored server-side and later rendered back into the thread page without adequate HTML sanitization or contextual output encoding. This vulnerability is fixed in 4.0.5 and 3.2.12.

VendorProductVersions

YAFNET

YAFNET

affected
>= 4.0.0-beta.1, < 4.0.5
affected
< 3.2.12

Weaknesses (CWE)

CWE-79
CWE-80
CWE-116

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

References

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