HIGHCVE-2026-43939Published Modified CNA GitHub_M
CVE-2026-43939: YAF.NET: Stored XSS in Forum Thread Posts/Replies Allowing Arbitrary JavaScript Execution for All Thread Viewers
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.
Metrics
- CVSS v3.1
- 7.3
- Severity
- HIGH
- Fixed in
- —
- Affected Products
- 1
Affected packages
- YAFNET / YAFNET>= 4.0.0-beta.1, < 4.0.5 · < 3.2.12
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N