CVE-2025-23956

High

Published: 03 March 2025

Published

03 March 2025

Modified

23 April 2026

KEV Added

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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 0.0035 57.6th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-23956 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 Exploit Public-Facing Application (T1190); ranked in the top 42.4% of CVEs by exploit likelihood; 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-2025-23956 is a Reflected Cross-site Scripting (XSS) vulnerability, stemming from CWE-79 (Improper Neutralization of Input During Web Page Generation), in the WP Easy Post Mailer plugin (wp-mailer) developed by Richard Leishman. The flaw affects all versions of the plugin from its initial release through 0.64, allowing malicious input to be reflected and executed as script in users' browsers.

With 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), the vulnerability can be exploited by unauthenticated remote attackers over the network with low complexity, though it requires user interaction such as clicking a crafted link or visiting a malicious page. Exploitation enables arbitrary script execution in the victim's browser context, resulting in low impacts to confidentiality, integrity, and availability, but with changed scope that could affect server resources or other users.

Mitigation details are available in the Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/wp-mailer/vulnerability/wordpress-wp-easy-post-mailer-plugin-0-64-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2025-5683

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Richard Leishman WP Easy Post Mailer wp-mailer allows Reflected XSS.This issue affects WP Easy Post Mailer: from n/a through <= 0.64.

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1059.007 JavaScript Execution

Adversaries may abuse various implementations of JavaScript for execution.

attack.mitre.org →

Why these techniques?

The reflected XSS vulnerability in a public-facing WordPress plugin directly enables exploitation of public-facing applications (T1190) and facilitates arbitrary JavaScript execution in the victim's browser (T1059.007).

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