CVE-2023-51736Network attack vector

Stored script execution via unvalidated VPN username

Published Jan 17, 2024 · Updated Jun 2, 2025

Stored XSS in Skyworth Digital CM5100 4.1.1.24 and earlier allows remote authenticated users to inject script through its web interface. The L2TP/PPTP Username handler insufficiently validates crafted input before persisting it for later rendering, causing a browser to execute the stored script. Exploitation requires high-privilege web access and a user to view the affected page, enabling script execution in that user's browser without interrupting the device.

CVSS severity6.9
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Skyworth Digital CM5100 4.1.1.24 and earlier allows remote authenticated users to inject script through its web interface. The L2TP/PPTP Username handler insufficiently validates crafted input before persisting it for later rendering, causing a browser to execute the stored script. Exploitation requires high-privilege web access and a user to view the affected page, enabling script execution in that user's browser without interrupting the device.

The record

CVE
CVE-2023-51736
Published
Jan 17, 2024
Updated
Jun 2, 2025
Vendor
Skyworth Digital
Product
CM5100
Classifications
CWE-79, CAPEC-592, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 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=0 <=4.1.1.24

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Skyworth Digital · CM5100version=0 <=4.1.1.24

Published CVSS scores

6.9CERT-InCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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