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Vulnerability details

CVE-2026-7635

gdragon coreActivity: Activity Logging for WordPress

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

CVSS 3.1
8.1High

Official 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 scores

ScoreVersionSourceVector
8.1High 3.1 CVEProject cvelistV5 (CNA) (Wordfence) CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
gdragon coreActivity: Activity Logging for WordPress v ≤ 3.0 CVEProject cvelistV5 (CNA)

References and advisories

12
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Details

Published
2026-05-13
Last updated
2026-05-13
State
Published
Assigner (CNA)
Wordfence

Exploit prediction (EPSS)

0.48%
Probability of exploitation in 30 days
41.7%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-502
    Deserialization of Untrusted Data