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CVE-2026-16778— Live Composer <= 2.1.21 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'dslc_module_downloads_output' Shortcode Content

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 插件 “Live Composer – Free WordPress Website Builder” 在所有 2.1.21 版本及之前版本中，因输入未充分净化且输出未正确转义，存在存储型跨站脚本（Stored XSS）漏洞。该漏洞可通过 'dslc_module_downloads_output' 短代码内容触发。拥有贡献者级别或更高权限的已认证攻击者可利用此漏洞，在页面中注入任意 Web 脚本，当用户访问被注入的页面时，这些脚本将被执行。 保存过程中的 过滤检查被绕过，因为攻击载荷以序列化字

CVSS 6.4 · Medium EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
livecomposer Live Composer – Free WordPress Website Builder ≤ 2.1.21 affected
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I. Basic Information for CVE-2026-16778

Vulnerability Information
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Vulnerability Title
Live Composer <= 2.1.21 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'dslc_module_downloads_output' Shortcode Content
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_downloads_output' Shortcode Content in all versions up to, and including, 2.1.21 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 save-time wp_kses_post check is bypassed because the payload is stored as a serialized string containing no HTML tags for kses to tokenize, and the shortcode callback re-emits attacker-controlled values — including view_all_link (href attribute), main_heading_title (h2 body), button_text (anchor body), and button_inline_svg (anchor body) — without any escaping at render 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 ~ 2.1.21 -

II. Public POCs for CVE-2026-16778

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III. Intelligence Information for CVE-2026-16778

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Other References for CVE-2026-16778 (3)

IV. Related Vulnerabilities

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