Cyber Resilience

CVE-2025-23888

High

Published: 24 January 2025

Published
24 January 2025
Modified
23 April 2026
KEV Added
—
Patch
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CVSS Score v3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
EPSS Score 0.0013 32.1th percentile
Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-23888 is a high-severity Cross-site Scripting (CWE-79) vulnerability. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Malicious Link (T1204.001); ranked at the 32.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).

Deeper analysis

CVE-2025-23888 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the GrandSlambert Custom Page Extensions WordPress plugin (custom-page-extensions). This issue affects all versions from n/a through 0.6 inclusive. The vulnerability was published on 2025-01-24 and carries a CVSS v3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L).

Attackers can exploit this vulnerability remotely over the network with low attack complexity and no required privileges, but it requires user interaction, such as clicking a malicious link. Exploitation enables reflected XSS, allowing attackers to inject and execute arbitrary scripts in the context of a victim's browser, potentially leading to low impacts on confidentiality, integrity, and availability within a changed security scope.

The Patchstack advisory (https://patchstack.com/database/Wordpress/Plugin/custom-page-extensions/vulnerability/wordpress-custom-page-extensions-plugin-0-6-cross-site-scripting-xss-vulnerability?_s_id=cve) documents the vulnerability specifically in Custom Page Extensions version 0.6 for WordPress.

EU & UK References

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in GrandSlambert Custom Page Extensions custom-page-extensions allows Reflected XSS.This issue affects Custom Page Extensions: from n/a through <= 0.6.

CWE(s)
CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1204.001 Malicious Link Execution
An adversary may rely upon a user clicking a malicious link in order to gain execution.
attack.mitre.org →
T1059.007 JavaScript Execution
Adversaries may abuse various implementations of JavaScript for execution.
attack.mitre.org →
Why these techniques?

Reflected XSS requires clicking a malicious link (T1204.001) and directly enables arbitrary JavaScript execution in the victim's browser (T1059.007).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2025-26583Shared CWE-79
CVE-2026-24943Shared CWE-79
CVE-2025-22711Shared CWE-79
CVE-2025-23736Shared CWE-79
CVE-2025-23885Shared CWE-79
CVE-2025-23624Shared CWE-79
CVE-2024-13891Shared CWE-79
CVE-2025-68894Shared CWE-79
CVE-2025-23492Shared CWE-79
CVE-2025-23798Shared CWE-79

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-15 Information Output Filtering good match
prevent

SI-15 requires filtering information prior to web page generation to prevent reflected XSS by neutralizing malicious scripts in outputs.

SI-10 Information Input Validation good match
prevent

SI-10 enforces validation of user inputs to block malicious payloads that enable reflected XSS in the WordPress plugin.

SI-2 Flaw Remediation good match
prevent

SI-2 mandates timely flaw remediation, directly addressing the improper input neutralization vulnerability in Custom Page Extensions versions through 0.6.

References