CVE-2026-7637
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk44th percentile - higher than 44% of all known CVEs
Summary
The Boost plugin for WordPress up to version 2.0.3 is vulnerable to PHP Object Injection via deserialization of untrusted input in the STYXKEY-BOOST_USER_LOCATION cookie. Unauthenticated attackers can inject a PHP Object, but the vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site.
Risk Assessment
If a POP chain is present on the system, an attacker can delete arbitrary files, retrieve sensitive data, or execute code.
Recommendation
Update the Boost plugin to version 2.0.4 or later, which fixes the deserialization vulnerability.
Original NVD description (English source)
The Boost plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 2.0.3 via deserialization of untrusted input in the STYXKEY-BOOST_USER_LOCATION cookie. This makes it possible for unauthenticated attackers to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.