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CVE-2026-16502— Live Composer <= 2.1.18 - Authenticated (Contributor+) PHP Object Injection via 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 Live Composer是WordPress基金会开源的一款可视化网页设计插件。 WordPress Live Composer 2.1.18及之前版本存在反序列化注入漏洞，该漏洞源于对不受信任输入的反序列化，可能导致PHP对象注入，具有贡献者级别及以上权限的已认证攻击者可利用该漏洞，若存在POP链可能删除任意文件、检索敏感数据或执行代码。

CVSS 8.8 · High EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
livecomposer Live Composer – Free WordPress Website Builder ≤ 2.1.18 affected
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I. Basic Information for CVE-2026-16502

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Live Composer <= 2.1.18 - Authenticated (Contributor+) PHP Object Injection via Shortcode
Source: CVE Program / CVE List V5
Vulnerability Description
The Live Composer – Free WordPress Website Builder plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.1.18 via deserialization of untrusted input . This makes it possible for authenticated attackers, with contributor-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Live Composer 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Live Composer是WordPress基金会开源的一款可视化网页设计插件。 WordPress Live Composer 2.1.18及之前版本存在反序列化注入漏洞，该漏洞源于对不受信任输入的反序列化，可能导致PHP对象注入，具有贡献者级别及以上权限的已认证攻击者可利用该漏洞，若存在POP链可能删除任意文件、检索敏感数据或执行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
livecomposer Live Composer – Free WordPress Website Builder 0 ~ 2.1.18 -

II. Public POCs for CVE-2026-16502

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III. Intelligence Information for CVE-2026-16502

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Patches & Fixes for CVE-2026-16502 (2)

Vendor Pages for CVE-2026-16502 (1)

IV. Related Vulnerabilities

Same product: Live Composer – Free WordPress Website Builder
Same vendor: livecomposer
Same weakness: CWE-502

V. Comments for CVE-2026-16502

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