CVE-2023-2023Public exploitNetwork attack vector

Administrator-browser script execution via unescaped search parameter

Published May 30, 2023 · Updated Jan 9, 2025

Reflected XSS in Kunal Nagar Custom 404 Pro before 3.7.3 allows remote attackers to run script in an administrator's browser. The c4p-main administration page places the s search parameter into an HTML attribute without escaping quotation marks or event-handler markup. The victim must be logged in as an administrator and follow the crafted URL; execution remains within that user's browser context on the site.

CVSS severity6.1
Medium
EPSS probability1.71%
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 Kunal Nagar Custom 404 Pro before 3.7.3 allows remote attackers to run script in an administrator's browser. The c4p-main administration page places the s search parameter into an HTML attribute without escaping quotation marks or event-handler markup. The victim must be logged in as an administrator and follow the crafted URL; execution remains within that user's browser context on the site.

The record

CVE
CVE-2023-2023
Published
May 30, 2023
Updated
Jan 9, 2025
Vendor
Kunal Nagar
Product
Custom 404 Pro
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 9, 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 <3.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kunal Nagar · Custom 404 Proversion=0 <3.7.3

Published CVSS scores

6.1CISA-ADPCVSS: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')
T1189Drive-by Compromise

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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