LiveComposer Live Composer Plugin up to 2.1.19 on WordPress Shortcode do_shortcode cross site scripting

Summaryinfo

A vulnerability was found in LiveComposer Live Composer Plugin up to 2.1.19. It has been declared as problematic. This affects the function do_shortcode of the component Shortcode Handler. Executing a manipulation of the argument main_heading_title/view_all_link/main_heading_link_title/main_filter_title_all can lead to cross site scripting. The identification of this vulnerability is CVE-2026-16786. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in LiveComposer Live Composer Plugin up to 2.1.19. It has been declared as problematic. This vulnerability affects the function do_shortcode of the component Shortcode Handler. The manipulation of the argument main_heading_title/view_all_link/main_heading_link_title/main_filter_title_all with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is shared for download at wordfence.com. This vulnerability was named CVE-2026-16786 since 07/23/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• LiveComposer

Name

• Live Composer Plugin

Version

• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5
• 2.1.6
• 2.1.7
• 2.1.8
• 2.1.9
• 2.1.10
• 2.1.11
• 2.1.12
• 2.1.13
• 2.1.14
• 2.1.15
• 2.1.16
• 2.1.17
• 2.1.18
• 2.1.19

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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Once again VulDB remains the best source for vulnerability data.

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