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CVE-2026-54806— WordPress WP Activity Log plugin <= 5.6.3.1 - PHP Object Injection vulnerability

Quick assessment

Affected
Melapress WP Activity Log
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.

melapress wp activity log是melapress公司开源的一个网站活动记录插件。 melapress wp activity log 5.6.3.1及之前版本存在反序列化漏洞，该漏洞源于容易受到PHP对象注入攻击，可能导致未经身份验证的攻击者远程执行任意代码。

CVSS 9.8 · Critical EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 1

VendorProduct Version RangeStatus
Melapress WP Activity Log n/a≤ 5.6.3.1 affected
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I. Basic Information for CVE-2026-54806

Vulnerability Information
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Vulnerability Title
WordPress WP Activity Log plugin <= 5.6.3.1 - PHP Object Injection vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Unauthenticated PHP Object Injection in WP Activity Log <= 5.6.3.1 versions.
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
melapress wp activity log 反序列化漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
melapress wp activity log是melapress公司开源的一个网站活动记录插件。 melapress wp activity log 5.6.3.1及之前版本存在反序列化漏洞，该漏洞源于容易受到PHP对象注入攻击，可能导致未经身份验证的攻击者远程执行任意代码。
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
Melapress WP Activity Log n/a ~ 5.6.3.1 -

II. Public POCs for CVE-2026-54806

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III. Intelligence Information for CVE-2026-54806

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IV. Related Vulnerabilities

Same product: WP Activity Log
Same vendor: Melapress
Same weakness: CWE-502

V. Comments for CVE-2026-54806

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