WPBakery raw-HTML data permits Subscriber-level stored cross-site scripting
WPBakery Page Builder through 8.7.4 accepts attacker-controlled base64 content in the data parameter. Because the encoded value contains no HTML tags, it survives wp_kses_post() during save; the vc_raw_html shortcode template later decodes and emits it without adequate escaping. A Subscriber or higher can store script that executes when another user views the affected page.
- Component
- WPBakery Page Builder
- Plugin slug
js-composer- Affected
- <= 8.7.4
- Safe version
- See mitigation notes
- Published
- Sep 01, 2026
This CVE was published Sep 01, 2026 and is one of 3 known issues for this plugin.
Update, patch or deactivate.
Update to a confirmed release newer than 8.7.4 when available. Until then, restrict untrusted Subscriber access or disable the affected raw-HTML functionality when warranted, remove malicious encoded data, and invalidate privileged sessions if affected pages were viewed.
No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical 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.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N