XSS in Mehtevas Responsive Header Plugin
CVE-2026-1300
The Responsive Header plugin for WordPress is vulnerable to Stored Cross-Site Scripting via multiple plugin settings parameters in all versions up to, and including, 1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (12.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Mehtevas Responsive Header Plugin — versions 0
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/30821418-48c0-4bc6-8bf1-f5586…
- downloads.wordpress.org/plugin/responsive-header.1.0.zip
- wordpress.org/plugins/responsive-header/
- plugins.trac.wordpress.org/browser/responsive-header/trunk/rhp-settings.php
- plugins.trac.wordpress.org/browser/responsive-header/tags/1.0/rhp-settings.php
Frequently asked questions
- What is CVE-2026-1300?
- CVE-2026-1300 is a medium-severity vulnerability in Mehtevas Responsive Header Plugin, classified under Cross-site Scripting. CVSS score: 4.4/10. Published 2026-01-24.
- How severe is CVE-2026-1300?
- Medium severity. CVSS v3 base score is 4.4 out of 10.