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CVE-2026-16787— Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'dslc_custom_field' 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.

Live Composer – Free WordPress Website Builder 插件（适用于 WordPress）存在存储型跨站脚本（Stored Cross-Site Scripting, XSS）漏洞，影响版本为 2.1.19 及之前所有版本。该漏洞源于对 短代码（Shortcode）的输入未充分净化，且输出未进行转义。这使得拥有贡献者（Contributor）级别或更高权限的已认证攻击者能够向页面中注入任意 Web 脚本，当用户访问这些被注入的页面时，脚本将会被执行。

CVSS 6.4 · Medium

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-16787

Vulnerability Information
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Vulnerability Title
Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'dslc_custom_field' 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_custom_field' 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.
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-2026-16787

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III. Intelligence Information for CVE-2026-16787

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Patches & Fixes for CVE-2026-16787 (2)

Vendor Advisories for CVE-2026-16787 (1)

Proof of Concept for CVE-2026-16787 (1)

Vendor Pages for CVE-2026-16787 (1)

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

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
CVE-2026-16786 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-2026-16787

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