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CVE-2026-43938

🗓️ 12 May 2026 13:57:56Reported by GitHub_MType 
cve
 cve
🔗 web.nvd.nist.gov👁 17 Views🌐 WEB

Unauthenticated stored second-order XSS in admin event log via User-Agent header in YAF.NET.

Related
Detection
Affected
Refs
Paths
Vulners
Node
yafnetyafnetRange4.0.0-beta.14.0.5
OR
yafnetyafnetRange<3.2.12
[
  {
    "vendor": "YAFNET",
    "product": "YAFNET",
    "versions": [
      {
        "version": ">= 4.0.0-beta.1, < 4.0.5",
        "status": "affected"
      },
      {
        "version": "< 3.2.12",
        "status": "affected"
      }
    ]
  }
]
ParameterPositionPathDescriptionCWE
User-AgentheaderYetAnotherForum.NET/Pages/Admin/EventLog.cshtmlUser-Agent header is stored as JSON and later deserialized and interpolated into HTML without encoding, enabling XSS via the admin event-log page.CWE-79CWE-80CWE-116

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17 Jun 2026 10:50Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.18.1
EPSS0.00282
SSVC
17