CVE-2023-51540

FAUCET Score

CVE-2023-51540 describes a Stored Cross-site Scripting (XSS) vulnerability in Kunal Nagar Custom 404 Pro, affecting versions up to and including 3.10.0. This medium-severity flaw (CVSS 6.1) allows an unauthenticated attacker to inject malicious scripts into web pages, which could lead to information disclosure or limited impact on integrity, requiring user interaction. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		<= 3.10.0CPE match	cpe:2.3:a:kunalnagar:custom_404_pro::::::wordpress::*

CVSS Data

CVSS version used by this source: 3.1

7.1HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

LOW

Exploitability Score

2.8

Impact Score

3.7

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.35%

Probability of exploitation in next 30 days

EPSS Percentile

28.0%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0035 is in the 28th percentile among its peer group of 26,221 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

patchstack.com / database/vulnerability/custom-404-pro/wordpress-custom-404-pro-plugin-3-10-0-cross-site-scripting-xss-vulnerability

Third Party Advisory