CVE-2026-7635

HIGH EPSS 37.9%
Published May 13, 20261mo ago · Modified Jun 17, 20261w ago
8.1 CVSS 3.1
High
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Published May 13, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
8.1
Exploitability
2.2
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
37.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-502 Deserialization of Untrusted Data Validation

References 12

  • github.com https://github.com/dev4press/coreactivity/pull/3/changes/1f09331d66de7cf4bba9b6e396b0d4e7597fcde2
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/core/log/Core.php#L252
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/core/log/Device.php#L35
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/core/table/Logs.php#L161
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/vendor/dev4press/library/dev4press/core/plugins/DBLite.php#L268
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/vendor/dev4press/library/dev4press/wordpress/admin/Table.php#L290
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/coreactivity/trunk/core/log/Core.php#L252
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/coreactivity/trunk/core/log/Device.php#L35
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/coreactivity/trunk/core/table/Logs.php#L161
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/coreactivity/trunk/vendor/dev4press/library/dev4press/core/plugins/DBLite.php#L268
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/coreactivity/trunk/vendor/dev4press/library/dev4press/wordpress/admin/Table.php#L290
  • wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/59f30135-6dd9-4367-90a9-a10ad491357d?source=cve

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.