CVE-2026-16786: XSS (CVSS 6.4)

Description

The Live Composer – Free WordPress Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via dslc_module_testimonials_output Shortcode in all versions up to, and including, 2.1.19 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload survives save-time wp_kses_post filtering because KSES treats shortcode delimiters as opaque, and the unescaped fields — including main_heading_title, view_all_link, main_heading_link_title, and main_filter_title_all — are only rendered when do_shortcode() executes at page-view time.

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CVSS v3.1 Score

6.4

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0033

Probability of exploitation

0.27%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

References

Other References

https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.18/modules/testimonials/module.php#L5024 https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.18/modules/testimonials/module.php#L5251 https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.18/modules/testimonials/module.php#L5257 https://plugins.trac.wordpress.org/browser/live-composer-page-builder/tags/2.1.18/modules/testimonials/module.php#L5291 https://plugins.trac.wordpress.org/changeset?reponame=&old=3662813%40live-composer-page-builder&new=3662813%40live-composer-page-builder https://www.wordfence.com/threat-intel/vulnerabilities/id/852b1766-8674-44a0-843c-381cd4155a2b?source=cve

Frequently Asked Questions

What is CVE-2026-16786? +

The Live Composer – Free WordPress Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via dslc_module_testimonials_output Shortcode in all versions up to, and including, 2.1.19 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload survives save-time wp_kses_post filtering because KSES treats shortcode delimiters as opaque, and the unescaped fields — including main_heading_title, view_all_link, main_heading_link_title, and main_filter_title_all — are only rendered when do_shortcode() executes at page-view time. It has a CVSS v3.1 base score of 6.4 (MEDIUM).

How severe is CVE-2026-16786? +

CVE-2026-16786 has a CVSS v3.1 score of 6.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0033, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-16786? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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