CVE-2025-26556

High

Published: 15 March 2025

Published

15 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 0.0009 25.2th percentile

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

Summary

CVE-2025-26556 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 at the 25.2th 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-2025-26556 is an Improper Neutralization of Input During Web Page Generation vulnerability, enabling Reflected Cross-site Scripting (XSS) as classified under CWE-79, in the zzmaster WP AntiDDOS plugin (wpantiddos) for WordPress. This issue affects all versions from n/a through 2.0 inclusive. The vulnerability carries a CVSS v3.1 base score of 7.1, reflecting network accessibility (AV:N), low attack complexity (AC:L), no required privileges (PR:N), user interaction (UI:R), changed scope (S:C), and low impacts to confidentiality, integrity, and availability (C:L/I:L/A:L).

Attackers can exploit this vulnerability remotely over the network without authentication by crafting malicious inputs or links that are reflected unsanitized in the web page generation process. Exploitation requires a victim to interact with the malicious payload, such as clicking a link, which executes JavaScript in the context of the vulnerable WordPress site. This can enable theft of session cookies, keystroke logging, or other client-side attacks within the site's scope, potentially compromising user accounts or performing actions on behalf of the victim.

Advisories, including the Patchstack database entry at https://patchstack.com/database/Wordpress/Plugin/wpantiddos/vulnerability/wordpress-wp-antiddos-plugin-2-0-cross-site-scripting-xss-vulnerability?_s_id=cve, provide details on the vulnerability in WP AntiDDOS plugin version 2.0 and related mitigations for affected installations.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2025-6644

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in zzmaster WP AntiDDOS wpantiddos allows Reflected XSS.This issue affects WP AntiDDOS: from n/a through <= 2.0.

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?

Reflected XSS in public-facing WordPress plugin directly maps to T1190 for exploitation of the web app vulnerability; payload execution enables T1059.007 for JavaScript in browser context, facilitating cookie theft and input capture.

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