What is the CVSS score of CVE-2026-1300?

CVE-2026-1300 has a CVSS 3.1 base score of 4.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of WordPress are affected by CVE-2026-1300?

Organizations using Responsive Header should be aware of moderate risk from CVE-2026-1300, a cross-site scripting vulnerability rated CVSS 4.4.

How to fix or mitigate CVE-2026-1300?

Within 30 days: Identify affected systems running for WordPress is vulnerable to Stored Cross-Site Scripting v and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

WordPress CVE-2026-1300

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-01-24 security@wordfence.com

WordPress XSS

4.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

4.4 MEDIUM

AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:59 vuln.today

CVE Published

Jan 24, 2026 - 09:15 nvd

MEDIUM 4.4

DescriptionCVE.org

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.

AnalysisAI

Stored XSS in the WordPress Responsive Header plugin through version 1.0 allows authenticated administrators to inject malicious scripts into plugin settings that execute for all users viewing affected pages. This impacts multi-site WordPress installations or those with unfiltered_html disabled, requiring high privilege access and manual user interaction to trigger exploitation. No patch is currently available.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects the multiple plugin settings component of Responsive Header (WordPress plugin). 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 unfilt

Affected ProductsAI

Vendor: WordPress. Product: Responsive Header (WordPress plugin). Component: multiple plugin settings.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.