WordPress Cross-Site Scripting

Published on
26 Jun 2018

Many servers use WordPress version 4.4-4.8.1, which is vulnerable to a Cross-Site Scripting (XSS) in oEmbed. An unauthenticated attacker can inject JavaScript code into WordPress comments. If these comments are improperly stored because of limitations on the MySQL TEXT data type. The script in the comment section will be triggered when the comment is viewed.

The oEmbed is an added extra hardening around allowed HTML for better security. The oEmbed is used for improved sandboxing.


The following code will get executed under this vulnerability.

    <b onmouseover=alert('Wufff!')>click me!</b>


Impact and Fixes

Automated human-like penetration testing for your web apps & APIs
Teams using Beagle Security are set up in minutes, embrace release-based CI/CD security testing and save up to 65% with timely remediation of vulnerabilities. Sign up for a free account to see what it can do for you.

Written by
Co-founder, Director
Find website security issues in a flash
Improve your website's security posture with proactive vulnerability detection.
Free website security assessment
Experience the power of automated penetration testing & contextual reporting.