• Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
MUST READ

Law enforcement operations seized BlackSuit ransomware gang’s darknet sites

 | 

Arizona woman sentenced for aiding North Korea in U.S. IT job fraud scheme

 | 

Operation CargoTalon targets Russia’s aerospace with EAGLET malware,

 | 

Unpatched flaw in EoL LG LNV5110R cameras lets hackers gain Admin access

 | 

Koske, a new AI-Generated Linux malware appears in the threat landscape

 | 

Mitel patches critical MiVoice MX-ONE Auth bypass flaw

 | 

Coyote malware is first-ever malware abusing Windows UI Automation

 | 

SonicWall fixed critical flaw in SMA 100 devices exploited in Overstep malware attacks

 | 

DSPM & AI Are Booming: $17.87B and $4.8T Markets by 2033

 | 

Stealth backdoor found in WordPress mu-Plugins folder

 | 

U.S. CISA adds CrushFTP, Google Chromium, and SysAid flaws to its Known Exploited Vulnerabilities catalog

 | 

U.S. CISA urges FCEB agencies to fix two Microsoft SharePoint flaws immediately and added them to its Known Exploited Vulnerabilities catalog

 | 

Sophos fixed two critical Sophos Firewall vulnerabilities

 | 

French Authorities confirm XSS.is admin arrested in Ukraine

 | 

Microsoft linked attacks on SharePoint flaws to China-nexus actors

 | 

Cisco confirms active exploitation of ISE and ISE-PIC flaws

 | 

SharePoint under fire: new ToolShell attacks target enterprises

 | 

CrushFTP zero-day actively exploited at least since July 18

 | 

Hardcoded credentials found in HPE Aruba Instant On Wi-Fi devices

 | 

MuddyWater deploys new DCHSpy variants amid Iran-Israel conflict

 | 
  • Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
  • Home
  • Breaking News
  • Hacking
  • Security
  • KingComposer fixes a reflected XSS impacting 100,000 WordPress sites

KingComposer fixes a reflected XSS impacting 100,000 WordPress sites

Pierluigi Paganini July 10, 2020

An XSS vulnerability in the KingComposer page builder for WordPress impacts 100,000 websites using the WordPress plugin. 

Researchers at Wordfence Threat Intelligence team discovered a reflected cross-site scripting (XSS) vulnerability, tracked as CVE-2020-15299, in the KingComposer WordPress plugin that potentially impacts 100,000 websites. 

KingComposer a fast drag-and-drop page builder for WordPress websites, which comes complete with top-notch features embedded and a truly intuitive UI.

The vulnerability resides in Ajax functions used by the plugin to implement page builder features.

KingComposer is a WordPress plugin that allows Drag and Drop page building, and it registers a number of AJAX actions to accomplish this

One of the Ajax functions registered by KingComposer was no longer actively used, but could still be used by sending a POST request to wp-admin/admin-ajax.php with the action parameter set to kc_install_online_preset.

“One of these AJAX actions was no longer actively used by the plugin, but could still be used by sending a POST request to wp-admin/admin-ajax.php with the action parameter set to kc_install_online_preset.” reads the analysis published by Wordfence. “As such, if an attacker used base64-encoding on a malicious payload, and tricked a victim into sending a request containing this payload in the kc-online-preset-data parameter, the malicious payload would be decoded and executed in the victim’s browser.”

The Wordfence Threat Intelligence team discovered the XSS bug on June 25.

To exploit the vulnerability, the attacker has to trick the victim into clicking a specially crafted link.

Below the timeline of the vulnerability:

  • June 15, 2020 – The Wordfence Threat Intelligence team discovers an unpatched vulnerability while investigating newly patched vulnerabilities in the KingComposer plugin. We release a firewall rule covering both the patched and unpatched vulnerabilities to our Premium users.
  • June 16, 2020 – We attempt to contact the developers of the KingComposer plugin.
  • June 25, 2020 – We contact the WordPress Plugins team about the vulnerability.
  • June 26, 2020 – The WordPress Plugins team responds and indicates that they are in touch with the developers of the KingComposer plugin.
  • June 29, 2020 – Patched version of KingComposer is released.
  • July 15, 2020 – Firewall rule becomes available to Wordfence Free users.

This vulnerability has been addressed with the release of the version 2.9.5.

[adrotate banner=”9″][adrotate banner=”12″]

Pierluigi Paganini

(SecurityAffairs – hacking, WordPress)

[adrotate banner=”5″]

[adrotate banner=”13″]


facebook linkedin twitter

Hacking information security news IT Information Security KingComposer malware Pierluigi Paganini reflected XSS Security Affairs Security News Wordpress WordPress plugin

you might also like

Pierluigi Paganini July 26, 2025
Law enforcement operations seized BlackSuit ransomware gang’s darknet sites
Read more
Pierluigi Paganini July 26, 2025
Arizona woman sentenced for aiding North Korea in U.S. IT job fraud scheme
Read more

leave a comment

newsletter

Subscribe to my email list and stay
up-to-date!

    recent articles

    Law enforcement operations seized BlackSuit ransomware gang’s darknet sites

    Cyber Crime / July 26, 2025

    Arizona woman sentenced for aiding North Korea in U.S. IT job fraud scheme

    Intelligence / July 26, 2025

    Operation CargoTalon targets Russia’s aerospace with EAGLET malware,

    Intelligence / July 25, 2025

    Unpatched flaw in EoL LG LNV5110R cameras lets hackers gain Admin access

    Security / July 25, 2025

    Koske, a new AI-Generated Linux malware appears in the threat landscape

    Malware / July 25, 2025

    To contact me write an email to:

    Pierluigi Paganini :
    pierluigi.paganini@securityaffairs.co

    LEARN MORE

    QUICK LINKS

    • Home
    • Cyber Crime
    • Cyber warfare
    • APT
    • Data Breach
    • Deep Web
    • Digital ID
    • Hacking
    • Hacktivism
    • Intelligence
    • Internet of Things
    • Laws and regulations
    • Malware
    • Mobile
    • Reports
    • Security
    • Social Networks
    • Terrorism
    • ICS-SCADA
    • POLICIES
    • Contact me

    Copyright@securityaffairs 2024

    We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept All”, you consent to the use of ALL the cookies. However, you may visit "Cookie Settings" to provide a controlled consent.
    Cookie SettingsAccept All
    Manage consent

    Privacy Overview

    This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities...
    Necessary
    Always Enabled
    Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
    Non-necessary
    Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
    SAVE & ACCEPT