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CVE-2026-19853— CyberTutor｜NewSiteServer (NSS) - Missing Authentication

Quick assessment

Affected
CyberTutor NewSiteServer (NSS)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

由 CyberTutor 开发的新网站服务器（NewSiteServer，简称 NSS）存在一个缺少身份验证的漏洞。未认证的远程攻击者可以利用该特定功能，冒充学校向任何人发送邮件。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1534 · Internal Spearphishing
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I. Basic Information for CVE-2026-19853

Vulnerability Information
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Vulnerability Title
CyberTutor｜NewSiteServer (NSS) - Missing Authentication
Source: CVE Program / CVE List V5
Vulnerability Description
NewSiteServer (NSS) developed by CyberTutor has a Missing Authentication vulnerability. Unauthenticated remote attackers can exploit a specific functionality to send emails to anyone on behalf of the school.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
CyberTutor NewSiteServer (NSS) all -

II. Public POCs for CVE-2026-19853

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III. Intelligence Information for CVE-2026-19853

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Vendor Advisories for CVE-2026-19853 (2)

IV. Related Vulnerabilities

Same product: NewSiteServer (NSS)
Same vendor: CyberTutor
Same weakness: CWE-306

V. Comments for CVE-2026-19853

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