What is CVE-2019-15838?

CVE-2019-15838 is a medium-severity vulnerability in Kunalnagar Custom 404 Pro, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-08-30.

How severe is CVE-2019-15838?

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

Is CVE-2019-15838 known to be exploited?

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

XSS in Kunalnagar Custom 404 Pro

CVE-2019-15838

The custom-404-pro plugin before 3.2.8 for WordPress has reflected XSS, a different vulnerability than CVE-2019-14789.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-08-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (59.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Kunalnagar Custom 404 Pro

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

20142995/nuclei-templates

References

wordpress.org/plugins/custom-404-pro/ (Release Notes, Vendor Advisory)
wpvulndb.com/vulnerabilities/9857 (Third Party Advisory)

Frequently asked questions

What is CVE-2019-15838?: CVE-2019-15838 is a medium-severity vulnerability in Kunalnagar Custom 404 Pro, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-08-30.
How severe is CVE-2019-15838?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2019-15838 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.