CVE-2025-31570

High

Published: 31 March 2025

Published

31 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 0.0016 36.7th percentile

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

Summary

CVE-2025-31570 is a high-severity CSRF (CWE-352) 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 36.7th 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 SC-23 (Session Authenticity) and SI-10 (Information Input Validation).

Deeper analysis

CVE-2025-31570 is a Cross-Site Request Forgery (CSRF) vulnerability, classified under CWE-352, in the Related Posts Widget with Thumbnails WordPress plugin (advanced-css3-related-posts-widget) that enables Stored Cross-Site Scripting (XSS). The issue affects all versions from n/a through 1.2 inclusive, as published on 2025-03-31.

Attackers with network access can exploit this vulnerability without privileges (PR:N) through low-complexity methods (AC:L) that require user interaction (UI:R), such as tricking an authenticated site administrator into visiting a malicious page. Successful CSRF exploitation allows storage of XSS payloads, achieving low impacts on confidentiality, integrity, and availability (C:L/I:L/A:L) but with a changed scope (S:C), resulting in a CVSS v3.1 base score of 7.1.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/advanced-css3-related-posts-widget/vulnerability/wordpress-related-posts-widget-with-thumbnails-plugin-1-2-csrf-to-stored-xss-vulnerability?_s_id=cve provides additional details on the vulnerability.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2025-8749

Vulnerability details

Cross-Site Request Forgery (CSRF) vulnerability in wp-buy Related Posts Widget with Thumbnails advanced-css3-related-posts-widget allows Stored XSS.This issue affects Related Posts Widget with Thumbnails: from n/a through <= 1.2.

CWE(s): CWE-352

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?

CSRF to stored XSS in public-facing WordPress plugin directly enables T1190 (exploit public-facing application) and T1059.007 (JavaScript execution via XSS payload).

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