CVE-2026-19853Network attack vector

Unauthenticated email sending via exposed function

Published Aug 24, 2026 · Updated Aug 24, 2026

Missing authentication in NewSiteServer (NSS) allows remote attackers to send email to arbitrary recipients as the school. The published advisory identifies an exposed email-sending function but does not disclose its endpoint or the authentication check that is absent. No account or user interaction is required; the demonstrated consequence is unauthorized school-impersonating email, with no reported data disclosure or service interruption.

CVSS severity6.9
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in NewSiteServer (NSS) allows remote attackers to send email to arbitrary recipients as the school. The published advisory identifies an exposed email-sending function but does not disclose its endpoint or the authentication check that is absent. No account or user interaction is required; the demonstrated consequence is unauthorized school-impersonating email, with no reported data disclosure or service interruption.

The record

CVE
CVE-2026-19853
Published
Aug 24, 2026
Updated
Aug 24, 2026
Vendor
Zhejiang Zoneland Zongheng Network Technology Co., Ltd.
Product
NewSiteServer (NSS)
Classifications
CWE-306
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=all

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zhejiang Zoneland Zongheng Network Technology Co., Ltd. · NewSiteServer (NSS)version=all

Published CVSS scores

6.9TWCERT/CCCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
5.3TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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