What is CVE-2023-2023?

CVE-2023-2023 is a medium-severity vulnerability in Kunalnagar Custom 404 Pro, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-05-30.

How severe is CVE-2023-2023?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2023-2023 known to be exploited?

13 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Kunalnagar Custom 404 Pro

CVE-2023-2023

The Custom 404 Pro WordPress plugin before 3.7.3 does not escape some URLs before outputting them in attributes, leading to Reflected Cross-Site Scripting.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-05-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.017 (76.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Kunalnagar Custom 404 Pro
Custom 404 Pro — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

wpscan.com/vulnerability/8859843a-a8c2-4f7a-8372-67049d6ea317 (Exploit, technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2023-2023?: CVE-2023-2023 is a medium-severity vulnerability in Kunalnagar Custom 404 Pro, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-05-30.
How severe is CVE-2023-2023?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2023-2023 known to be exploited?: 13 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.