CVE-2023-0043Public exploitNetwork attack vector

Unauthenticated administrator script execution via unescaped dmsg parameter

Published Feb 27, 2023 · Updated Mar 10, 2025

Reflected XSS in Custom Add User 2.0.2 and earlier allows remote attackers to execute scripts in an administrator's browser. The settings page writes the dmsg query parameter into its response without sanitization or output escaping. Exploitation requires an administrator to open a crafted request, after which the injected script runs with that user's browser privileges.

CVSS severity6.1
Medium
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Custom Add User 2.0.2 and earlier allows remote attackers to execute scripts in an administrator's browser. The settings page writes the dmsg query parameter into its response without sanitization or output escaping. Exploitation requires an administrator to open a crafted request, after which the injected script runs with that user's browser privileges.

The record

CVE
CVE-2023-0043
Published
Feb 27, 2023
Updated
Mar 10, 2025
Vendor
Harshit Sanghvi
Product
Custom Add User
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 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 <=2.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Harshit Sanghvi · Custom Add Userversion=0 <=2.0.2

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

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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