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CVE-2026-13203— Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'custom_id' Shortcode Attribute

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.

以下是对该漏洞描述的中文翻译： WordPress 插件 The Live Composer – Free WordPress Website Builder 在 2.1.19 及更早版本中，存在通过 和 短代码的 属性引发的存储型跨站脚本（Stored XSS）漏洞。 漏洞成因：对用户提供的 属性缺乏充分的输入净化和输出转义。该属性未经 函数处理，直接拼接进 和 函数中渲染的 元素的 HTML 属性中。 影响：这使得拥有 Contributor（贡献者）权限或更高权限的已认证攻击者，能够在页面中注入任意 Web

CVSS 6.4 · Medium
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I. Basic Information for CVE-2026-13203

Vulnerability Information
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Vulnerability Title
Live Composer <= 2.1.19 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'custom_id' Shortcode Attribute
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 the 'custom_id' shortcode attribute of the dslc_modules_section and dslc_modules_area shortcodes in versions up to, and including, 2.1.19. This is due to insufficient input sanitization and output escaping on the user-supplied attribute, which is concatenated into the HTML id="" attribute of the rendered <div> element in the dslc_modules_section_front() and dslc_modules_area_front() functions without esc_attr(). 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-2026-13203

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III. Intelligence Information for CVE-2026-13203

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Patches & Fixes for CVE-2026-13203 (1)

Vendor Advisories for CVE-2026-13203 (1)

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-2026-16788 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-2026-13203

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