vulnwire
8.1high

CVE-2026-7635

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

Published 5 mo ago · modified 4 mo ago · JSON

CVSS
8.1
v3.1 · CNA
CISA KEV
No
not known exploited
EPSS
0.5%
percentile 42%
Public exploits
0
none known

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.

CISA SSVC assessment

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction (EPSS)

0.48% probability of exploitation in the next 30 days, higher than 42% of all scored CVEs.

CVSS scores

Assigned byVersionScoreVector
CNA3.18.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA3.18.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • gdragon coreActivity: Activity Logging for WordPress

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

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