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CVE-2026-16786— Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via dslc_module_testimonials_output Shortcode

Quick assessment

Affected
livecomposer Live Composer – Free WordPress Website Builder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的“Live Composer – Free WordPress Website Builder”插件在所有 2.1.19 及更早版本中，因输入未充分净化且输出未转义，导致其“dslc_module_testimonials_output”短代码存在存储型跨站脚本（Stored XSS）漏洞。这使得拥有贡献者（contributor）及以上权限的已认证攻击者，能够向页面中注入任意网页脚本；当用户访问被注入的页面时，这些脚本将自动执行。注入的恶意载荷之所以能绕过保存阶段的 过滤，是因为 KSES

CVSS 6.4 · Medium

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-16786

Vulnerability Information
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Vulnerability Title
Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via dslc_module_testimonials_output Shortcode
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
livecomposer Live Composer – Free WordPress Website Builder 0 ~ 2.1.19 -

II. Public POCs for CVE-2026-16786

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III. Intelligence Information for CVE-2026-16786

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Patches & Fixes for CVE-2026-16786 (1)

Other References for CVE-2026-16786 (5)

Same Patch Batch · livecomposer · 2026-09-01 · 4 CVEs total

CVE-2026-16787 6.4 MEDIUM Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'ds
CVE-2026-13203 6.4 MEDIUM Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'cu
CVE-2026-16788 6.4 MEDIUM Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via dsl

IV. Related Vulnerabilities

Same product: Live Composer – Free WordPress Website Builder
Same vendor: livecomposer
Same weakness: CWE-79

V. Comments for CVE-2026-16786

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