What’s Vulnerable › Vulnerabilities

CVE-2020-15299

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 47.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-07-09 · updated 2026-06-17
• Weakness: CWE-79

Description

A reflected Cross-Site Scripting (XSS) Vulnerability in the KingComposer plugin through 2.9.4 for WordPress allows remote attackers to trick a victim into submitting an install_online_preset AJAX request containing base64-encoded JavaScript (in the kc-online-preset-data POST parameter) that is executed in the victim's browser.

Affected products

• Page Builder: KingComposer – Free Drag and Drop page builder by King-Theme: through 2.9.4

References

• https://www.wordfence.com/blog/2020/07/xss-flaw-impacting-100000-sites-patched-in-kingcomposer/
• https://www.wordfence.com/blog/2020/07/xss-flaw-impacting-100000-sites-patched-in-kingcomposer/

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