Marc-Alexandre Montpas

About Marc-Alexandre Montpas

Marc-Alexandre Montpas is Sucuri’s Senior Security Analyst who joined the company in 2014. Marc’s main responsibilities include reversing security patches and scavenging vulnerabilities, old and new. His professional experience covers eight years of finding bugs in open-source software. When Marc isn’t breaking things, you might find him participating in a hacking CTF competition. Connect with him on Twitter.

October 30, 2020Marc-Alexandre Montpas

Reflected XSS in WordPress v5.5.1 and Lower

WordPress released version 5.5.2 yesterday, which fixed a reflected XSS vulnerability we reported earlier this year. The root cause of this issue is a bug in the way WordPress determines a user’s current page, and which may cause a few other problems as well. Are…

January 29, 2020Marc-Alexandre Montpas

Stored XSS in Elementor

During a routine audit of WordPress plugins last december, we discovered a Stored XSS vulnerability in the very popular Elementor Page Builder plugin, which powers no less than 3 million+…

Authentication Bypass Vulnerability in InfiniteWP Client <= 1.9.4.4

An authentication bypass vulnerability affecting more than 300,000 InfiniteWP Client plugin users has recently been disclosed to the public. This plugin allows site owners to manage multiple websites from one…

September 25, 2019Marc-Alexandre Montpas

Zero-Day RCE in vBulletin v5.0.0-v5.5.4

A new remote code execution (RCE) zero-day vulnerability has been disclosed by an anonymous researcher on the full disclosure mailing list this past Monday. This vulnerability is extremely severe. It…

September 13, 2019Marc-Alexandre Montpas

Dissecting the WordPress 5.2.3 Update

Last week, WordPress released version 5.2.3 which was a security and maintenance update, and as such, contained many security fixes. Part of our day to day work is to analyse…

June 11, 2019Marc-Alexandre Montpas

Stored XSS in MyBB <= 1.8.20

The open source PHP forum software myBB recently published a new update, version 1.8.21. This is a security release fixing a Stored XSS vulnerability in the private messaging and post…

June 4, 2019Marc-Alexandre Montpas

OS Command Injection in WP-Database-Backup

On May 28th, a critical OS Command Injection vulnerability affecting the WP-Database-Backup plugin was disclosed to the public by the Wordfence team. This is a very nasty bug which made…

April 5, 2019Marc-Alexandre Montpas

SQL Injection in Duplicate-Page WordPress Plugin

While investigating the Duplicate Page plugin, we have discovered a dangerous SQL Injection vulnerability. Though the plugin wasn’t abused externally, the vulnerability impacted over 800,000 sites. Its urgency is defined…

March 28, 2019Marc-Alexandre Montpas

SQL Injection in Magento Core

Magento has released a new security update fixing multiple types of vulnerabilities including Cross-Site Request Forgery, Cross-Site Scripting, SQL Injection, and Remote Code Execution. To be exploited, the majority of…

March 26, 2019Marc-Alexandre Montpas

Stored XSS Patched in WordPress 5.1.1

WordPress recently released an update, 5.1.1, which patches a stored XSS vulnerability in the platform’s comment system. Even 10 days after the release of this security patch, around 60% of…

March 21, 2019Marc-Alexandre Montpas

Zero-Day Stored XSS in Social Warfare

A zero-day vulnerability has just appeared in the WordPress plugin world, affecting over 70,000 sites using the Social Warfare plugin. The plugin is vulnerable to a Stored XSS (Cross-Site Scripting)…