coreActivity: Activity Logging for WordPress <= 3.0 - Unauthenticated PHP Object Injection via 'user_agent' Log Meta Field

Wordfence Intelligence   >   Vulnerability Database   >   coreActivity: Activity Logging for WordPress <= 3.0 - Unauthenticated PHP Object Injection via 'user_agent' Log Meta Field
8.1
Deserialization of Untrusted Data
CVE CVE-2026-7635
CVSS 8.1 (High)
Publicly Published May 12, 2026
Last Updated May 13, 2026
Researchers Duong Quang Hao
Thai Son Dinh (sondt) - VinSOC

Description

The coreActivity: Activity Logging for WordPress plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.0. This is due to the plugin failing to validate or strip PHP serialization syntax from the User-Agent HTTP header before storing it in the logmeta table, and subsequently calling `maybe_unserialize()` on every retrieved `meta_value` in `query_metas()` without verifying the data was originally serialized by the application. This makes it possible for unauthenticated attackers to inject a crafted PHP serialized payload via the User-Agent header during any logged event (such as a failed login attempt), which, when an administrator views the Logs page, is deserialized and passed to `DeviceDetector::setUserAgent()`, triggering a Fatal TypeError that creates a persistent Denial of Service condition blocking administrator access to the Logs page entirely.

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Vulnerability Details for coreActivity: Activity Logging for WordPress

coreActivity: Activity Logging for WordPress

Software Type Plugin
Software Slug coreactivity (view on wordpress.org)
Patched? Yes
Remediation Update to version 3.1, or a newer patched version
Affected Version
  • <= 3.0
Patched Version
  • 3.1

Recent vulnerabilities in coreActivity: Activity Logging for WordPress

coreActivity: Activity Logging for WordPress <= 2.7 - Authenticated (Subscriber+) SQL Injection
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CVE-2025-3436
Apr 7, 2025
Researcher: Yassine Neggaoui (Y45NG)
coreActivity <= 2.0.1 - IP Spoofing
5.3
CVE-2024-0868
Mar 27, 2024
Researcher: Erwan LR
coreActivity <= 1.8 - Unauthenticated Stored Cross-Site Scripting
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CVE-2024-0852
Jan 26, 2024
Researcher: Ahmed Algohary
# Title CVE ID CVSS Researchers Date
1 coreActivity: Activity Logging for WordPress <= 2.7 - Authenticated (Subscriber+) SQL Injection CVE-2025-3436 6.5 Yassine Neggaoui (Y45NG) April 7, 2025
2 coreActivity <= 2.0.1 - IP Spoofing CVE-2024-0868 5.3 Erwan LR March 27, 2024
3 coreActivity <= 1.8 - Unauthenticated Stored Cross-Site Scripting CVE-2024-0852 7.2 Ahmed Algohary January 26, 2024
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