CVE-2021-43657Network attack vector

Stored script execution via unsanitized MAster.php inputs

Published Dec 22, 2022 · Updated Apr 16, 2025

Stored XSS in Sourcecodetester Simple Client Management System 1.0 allows remote authenticated users to run script in another user's browser. The record attributes the flaw to MAster.php storing unneutralized HTML or JavaScript, but its linked report describes another product, leaving exact fields unverified. Low-privilege access is required to plant the payload, and another user must view the stored value; execution occurs in the viewer's browser context.

CVSS severity5.4
Medium
EPSS probability0.72%
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 Sourcecodetester Simple Client Management System 1.0 allows remote authenticated users to run script in another user's browser. The record attributes the flaw to MAster.php storing unneutralized HTML or JavaScript, but its linked report describes another product, leaving exact fields unverified. Low-privilege access is required to plant the payload, and another user must view the stored value; execution occurs in the viewer's browser context.

The record

CVE
CVE-2021-43657
Published
Dec 22, 2022
Updated
Apr 16, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4CISA-ADPCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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