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

Quick assessment

Affected
CyberTutor NewSiteServer (NSS)
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CyberTutor NewSiteServer是中国CyberTutor公司的一款网站服务器设备。 CyberTutor NewSiteServer存在授权问题漏洞，该漏洞源于缺失身份验证，可能导致未经身份验证的远程攻击者利用特定功能代表学校向任何人发送电子邮件。

CVSS 5.3 · Medium EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1534 · Internal Spearphishing

Affected Version Matrix 1

VendorProduct Version RangeStatus
CyberTutor NewSiteServer (NSS) all affected
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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
Vulnerability Title
CyberTutor NewSiteServer 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CyberTutor NewSiteServer是中国CyberTutor公司的一款网站服务器设备。 CyberTutor NewSiteServer存在授权问题漏洞，该漏洞源于缺失身份验证，可能导致未经身份验证的远程攻击者利用特定功能代表学校向任何人发送电子邮件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

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

II. Public POCs for CVE-2026-19853

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
default-local-qwen3.6 · 10923 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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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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