CVE-2026-15101
Received Received - Intake

Stored XSS in WPBakery Page Builder for WordPress

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: Wordfence

Description
The WPBakery Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'data' parameter in all versions up to, and including, 8.7.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The wp_kses_post sanitization applied during save does not neutralize the payload because the malicious script content is base64-encoded as plain alphanumeric text with no HTML tags to strip; the vc_raw_html shortcode template then decodes and echoes this content unescaped at render time.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-01
Last Modified
2026-09-01
Generated
2026-09-01
AI Q&A
2026-09-01
EPSS Evaluated
N/A
NVD
CVE-2026-15101
EUVD
EUVD-2026-69000

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpbakery page_builder to 8.7.4 (inc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the WPBakery Page Builder plugin for WordPress. It allows authenticated attackers with subscriber-level access or higher to inject malicious scripts into web pages via the 'data' parameter. The vulnerability exists due to insufficient input sanitization and output escaping in versions up to 8.7.4.

Detection Guidance

Check for unauthorized scripts in WordPress pages using WPBakery Page Builder. Inspect page source for base64-encoded payloads in the 'data' parameter. Use Wordfence or similar security plugins to scan for malicious scripts.

Impact Analysis

An attacker could inject scripts that execute whenever a user visits an affected page. This could lead to theft of user sessions, defacement of websites, or redirection to malicious sites. The impact depends on user privileges and the nature of the injected payload.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, which may violate GDPR (data protection) and HIPAA (health information privacy) requirements. Organizations using the vulnerable plugin may face compliance violations if user data is compromised.

Mitigation Strategies

Update WPBakery Page Builder to the latest version. Remove suspicious scripts from pages. Restrict subscriber-level access to prevent unauthorized edits. Monitor for unusual activity.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-15101. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart