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CVE-2026-27084— WordPress Buisson theme <= 1.1.11 - PHP Object Injection vulnerability

Quick assessment

Affected
ThemeREX Buisson
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和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Buisson 1.1.11及之前版本存在代码问题漏洞，该漏洞源于反序列化不可信数据，可能导致对象注入。

CVSS 9.8 · Critical EPSS 0.56% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-27084

Vulnerability Information
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Vulnerability Title
WordPress Buisson theme <= 1.1.11 - PHP Object Injection vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Deserialization of Untrusted Data vulnerability in ThemeREX Buisson buisson allows Object Injection.This issue affects Buisson: from n/a through <= 1.1.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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 plugin Buisson 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Buisson 1.1.11及之前版本存在代码问题漏洞，该漏洞源于反序列化不可信数据，可能导致对象注入。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
ThemeREX Buisson 0 ~ 1.1.11 -

II. Public POCs for CVE-2026-27084

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III. Intelligence Information for CVE-2026-27084

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Vendor Advisories for CVE-2026-27084 (1)

Same Patch Batch · ThemeREX · 2026-03-25 · 6 CVEs total

CVE-2026-27083 9.8 CRITICAL WordPress Work & Travel Company theme <= 1.2 - PHP Object Injection vulnerability
CVE-2026-27082 9.8 CRITICAL WordPress Love Story theme <= 1.3.12 - PHP Object Injection vulnerability
CVE-2026-22494 8.1 HIGH WordPress Good Homes theme <= 1.3.13 - Local File Inclusion vulnerability
CVE-2026-22503 8.1 HIGH WordPress Nelson theme <= 1.2.0 - Local File Inclusion vulnerability
CVE-2026-22504 8.1 HIGH WordPress ProLingua theme <= 1.1.12 - Local File Inclusion vulnerability

IV. Related Vulnerabilities

Same vendor: ThemeREX
Same weakness: CWE-502

V. Comments for CVE-2026-27084

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