CVE-2021-47738Public exploitNetwork attack vectorHinoki check available

Administrator-session script execution via User-Agent header

Published Dec 23, 2025 · Updated Dec 23, 2025

Stored cross-site scripting in CSZ CMS 1.2.7 allows remote authenticated users to execute JavaScript in an administrator's browser. The /member/insertpm endpoint stores the User-Agent request header without neutralizing script markup and renders it in the backend dashboard. Member access and an administrator viewing the resulting private message are required, enabling script execution in the administrator's web session.

CVSS severity5.1
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored cross-site scripting in CSZ CMS 1.2.7 allows remote authenticated users to execute JavaScript in an administrator's browser. The /member/insertpm endpoint stores the User-Agent request header without neutralizing script markup and renders it in the backend dashboard. Member access and an administrator viewing the resulting private message are required, enabling script execution in the administrator's web session.

The record

CVE
CVE-2021-47738
Published
Dec 23, 2025
Updated
Dec 23, 2025
Vendor
CSZ CMS
Product
CSZ CMS
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.2.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

CSZ CMS · CSZ CMSversion=1.2.7

Published CVSS scores

5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
5.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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