CVE-2025-26589
Published: 03 March 2025
Summary
CVE-2025-26589 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 42.7th 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 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Information Output Filtering directly prevents reflected XSS by sanitizing user input before rendering it in web pages, addressing the improper neutralization flaw in the IE CSS3 Support plugin.
Information Input Validation ensures plugin inputs are checked against expected formats, blocking malicious payloads that exploit the reflected XSS vulnerability.
Flaw Remediation requires timely patching of the vulnerable IE CSS3 Support plugin up to version 2.0.1, eliminating the specific XSS vulnerability as advised by Patchstack.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Reflected XSS in public-facing WordPress plugin enables crafting malicious links for user-triggered arbitrary JavaScript execution in browser context.
NVD Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Cristopher Dino IE CSS3 Support ie-css3-support allows Reflected XSS.This issue affects IE CSS3 Support: from n/a through <= 2.0.1.
Deeper analysisAI
CVE-2025-26589 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the IE CSS3 Support WordPress plugin by Cristopher Dino. The ie-css3-support plugin is affected in all versions from n/a through 2.0.1.
Unauthenticated attackers can exploit this vulnerability over the network (AV:N) with low attack complexity (AC:L), requiring user interaction (UI:R) such as clicking a malicious link. Exploitation enables execution of arbitrary scripts in the victim's browser context with changed scope (S:C), resulting in low impacts to confidentiality, integrity, and availability (C:L/I:L/A:L), as scored at CVSS 7.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L).
The Patchstack advisory provides details on mitigation for this vulnerability in the IE CSS3 Support plugin version 2.0.1: https://patchstack.com/database/Wordpress/Plugin/ie-css3-support/vulnerability/wordpress-ie-css3-support-plugin-2-0-1-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve.
Details
- CWE(s)