CVE-2025-23535

High

Published: 22 January 2025

Published

22 January 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 0.0010 27.4th percentile

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

Summary

CVE-2025-23535 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 27.4th 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-2025-23535 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Stored Cross-site Scripting (XSS) under CWE-79, in the REAL WordPress Sidebar drag-and-drop-custom-sidebar plugin by martin_ziegert. This issue affects the plugin from unknown initial versions through version 0.1 inclusive.

Attackers can exploit this vulnerability remotely over the network (AV:N) with low attack complexity (AC:L), requiring no privileges (PR:N) but user interaction (UI:R). Exploitation changes scope (S:C), enabling stored malicious scripts to execute in victims' browsers when viewing affected pages, resulting in low impacts to confidentiality, integrity, and availability (C:L/I:L/A:L) for a CVSS v3.1 base score of 7.1.

Patchstack advisories document the vulnerability in their database entry for the WordPress REAL WordPress Sidebar plugin version 0.1, detailing the Cross-site Scripting issue.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2025-3236

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in martin_ziegert REAL WordPress Sidebar drag-and-drop-custom-sidebar allows Stored XSS.This issue affects REAL WordPress Sidebar: from n/a through <= 0.1.

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 →

Why these techniques?

Stored XSS in public-facing WordPress plugin directly enables remote exploitation of a web application vulnerability to inject and execute malicious scripts in victims' browsers.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1