{"cve":"CVE-2026-7635","nvd":{"published":"2026-05-13T05:16:24.737","modified":"2026-06-17T11:02:42.980","status":"Deferred","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1},"cwes":["CWE-502"],"references":["https://github.com/dev4press/coreactivity/pull/3/changes/1f09331d66de7cf4bba9b6e396b0d4e7597fcde2","https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/core/log/Core.php#L252","https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/core/log/Device.php#L35","https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/core/table/Logs.php#L161","https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/vendor/dev4press/library/dev4press/core/plugins/DBLite.php#L268"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-7635","score":0.00481,"percentile":0.41471,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}