The Custom 404 Pro plugin 3.2.8 for WordPress has XSS via the wp-admin/admin.php?page=c4p-main page parameter.

published 2019-08-15 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-5921

cvss: 6.1; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.6%; EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits: 0; none known, plus a Nuclei check

Exploit prediction

1.61% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template Custom 404 Pro < 3.2.8 - Cross-Site Scripting nuclei detection template
pluginvulnerabilities.com https://www.pluginvulnerabilities.com/2019/06/25/other-vulnerability-data-sources-miss-that-a-reflected-xss-vulnerability-in-custom-404-pro-hasnt-been-fixed/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	6.1	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

Technology feeds

WordPress rss critical rss

References

pluginvulnerabilities.com /2019/06/25/other-vulnerability-data-sources-miss-that-a-reflected-xss-vulnerability-in-custom-404-pro-hasnt-b
exploit, third-party-advisory
wordpress.org /plugins/custom-404-pro/#developers
release-notes

Sources

CVE List CVE-2019-14789
NVD CVE-2019-14789

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary