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WordPress plugin

Page Builder: KingComposer – Free Drag and Drop page builder by King-Theme <= 2.9.4 — Reflected Cross-Site Scripting

CVE-2020-15299Published · Updated

Action summary

Affected: ≤2.9.4Update to 2.9.5 or newer

All remediation steps
Watch plugin
Severity
Medium6.1
CVSS
6.1
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:R User interaction
Required
S:C Scope
Changed
C:L Confidentiality
Low
I:L Integrity
Low
A:N Availability
None
Weakness
CWE-79 Cross-Site Scripting
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Page Builder: KingComposer – Free Drag and Drop page builder by King-Theme kingcomposer

  1. Affected≤ 2.9.4
  2. Patched in2.9.5

Update to 2.9.5 or newer.

You are affected if you run ≤ 2.9.4. Version 2.9.5 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Page Builder: KingComposer – Free Drag and Drop page builder by King-Theme.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 2.9.5, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Page Builder: KingComposer – Free Drag and Drop page builder by King-Theme to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Ram.

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.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Page Builder: KingComposer – Free Drag and Drop page builder by King-Theme

All 8
More vulnerabilities in Page Builder: KingComposer – Free Drag and Drop page builder by King-Theme
SeverityVulnerabilityCVEPublished
High8.5Authenticated Arbitrary Profile Creation and Stored Cross-Site Scripting
≤2.9.6No patch available
CVE-2021-25048
High8.8Open Redirect
≤2.9.6No patch available
CVE-2022-0165
Medium5.5Stored Cross-Site Scripting
<2.9.4Update to 2.9.4
CVE-2020-36709
High8.8Authorization Bypass due to Improper Access Control
≤2.9.3Update to 2.9.4
CVE-2020-36700
High8.8Arbitrary File Upload
≤2.9.3Update to 2.9.4
CVE-2020-36701

Same weakness (Cross-Site Scripting)

All Cross-Site Scripting
Other Cross-Site Scripting vulnerabilities
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688
Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder≤1.0.2Update to 1.1
CVE-2026-125055
Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System≤3.3.9Update to 3.4.0
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity medium, CVSS 6.1

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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