WordPress Core 6.3 - 6.3.1 - Authenticated(Contributor+) Cross-Site Scripting via Footnotes Block

6.4
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS 6.4 (Medium)
Publicly Published October 12, 2023
Last Updated October 12, 2023
Researcher Jorge Costa

Description

WordPress Core is vulnerable to Stored Cross-Site Scripting via the footnotes block in versions between 6.3 and 6.3.1 due to insufficient input sanitization and output escaping on the footnotes block. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Wordfence blocked 1 attacks targeting this vulnerability in the past 24 hours.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

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Vulnerability Details for WordPress

Software Type Core
Patched? Yes
Remediation Update to version 6.3.2, or a newer patched version
Affected Version
  • 6.3 - 6.3.1
Patched Version
  • 6.3.2

Recent vulnerabilities in WordPress

# Title CVE ID CVSS Researchers Date
1 WordPress <= 6.9.1 - Cross-Site Scripting via Client-Side Template Override in Admin Area 4.4 Asaf Mozes March 10, 2026
2 WordPress <= 6.9.1 - Missing Authorization to Authenticated (Author+) Sensitive Information Disclosure via query-attachments AJAX Endpoint 4.3 Vitaly Simonovich March 10, 2026
3 WordPress 6.9 - 6.9.1 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Note Creation via REST API CVE-2026-3906 4.3 kaminuma March 10, 2026
4 WordPress <= 6.9.1 - Authenticated (Author+) XML External Entity Injection via getID3 Library Media Upload 6.5 Youssef Achtatal March 10, 2026
5 WordPress <= 6.9.1 - Authenticated (Administrator+) Stored Cross-Site Scripting via Navigation Menu Items 4.4 sibwtf March 10, 2026
6 WordPress <= 6.9.1 - Unauthenticated Blind Server-Side Request Forgery via XML-RPC Pingback Discovery 5.8 sibwtf March 10, 2026
7 WordPress <= 6.8.2 - Authenticated (Contributor+) Sensitive Information Exposure CVE-2025-58246 4.3 Abu Hurayra (HurayraIIT) September 22, 2025
8 WordPress <= 6.8.2 - Authenticated (Author+) Stored Cross-Site Scripting CVE-2025-58674 6.4 SavPhill (Savphill) September 22, 2025
9 WordPress Core < 6.5.5 - Authenticated (Contributor+) Stored Cross-Site Scripting via HTML API CVE-2024-6307 6.4 Alex Concha, Dennis Snell, Grzegorz Ziółkowski, Aaron Jorbin June 24, 2024
10 WordPress Core < 6.5.5 - Authenticated (Contributor+) Stored Cross-Site Scripting via Template Part Block CVE-2024-31111 6.4 Rafie Muhammad June 24, 2024

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