CVE-2026-7635
coreActivity: Activity Logging for WordPress <= 3.0 - Unauthenticated PHP Object Injection via 'user_agent' Log Meta Field
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.
INFO
Published Date :
May 13, 2026, 5:16 a.m.
Last Modified :
May 13, 2026, 2:43 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the plugin to the latest version.
- Remove the plugin if it cannot be updated.
- Monitor logs for suspicious activity.
Public PoC/Exploit Available at Github
CVE-2026-7635 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-7635.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-7635 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-7635
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
all my bug and CVE
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-7635 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-7635 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
May. 13, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-502 Added Reference https://github.com/dev4press/coreactivity/pull/3/changes/1f09331d66de7cf4bba9b6e396b0d4e7597fcde2 Added Reference https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/core/log/Core.php#L252 Added Reference https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/core/log/Device.php#L35 Added Reference https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/core/table/Logs.php#L161 Added Reference https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/vendor/dev4press/library/dev4press/core/plugins/DBLite.php#L268 Added Reference https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/vendor/dev4press/library/dev4press/wordpress/admin/Table.php#L290 Added Reference https://plugins.trac.wordpress.org/browser/coreactivity/trunk/core/log/Core.php#L252 Added Reference https://plugins.trac.wordpress.org/browser/coreactivity/trunk/core/log/Device.php#L35 Added Reference https://plugins.trac.wordpress.org/browser/coreactivity/trunk/core/table/Logs.php#L161 Added Reference https://plugins.trac.wordpress.org/browser/coreactivity/trunk/vendor/dev4press/library/dev4press/core/plugins/DBLite.php#L268 Added Reference https://plugins.trac.wordpress.org/browser/coreactivity/trunk/vendor/dev4press/library/dev4press/wordpress/admin/Table.php#L290 Added Reference https://www.wordfence.com/threat-intel/vulnerabilities/id/59f30135-6dd9-4367-90a9-a10ad491357d?source=cve