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9.8
CVE-2026-7637: Boost plugin for WordPress vulnerable to malicious cookie injection.
CVE-2026-7637
Summary
The Boost plugin for WordPress has a security flaw that could allow hackers to inject malicious code into your website if they can trick a user into accepting a certain cookie. This only happens if you have another plugin or theme installed that could be used to exploit the injected code. To stay safe, keep your plugins and themes up to date and monitor your website for any suspicious activity.
Original title
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 m...
Original description
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.
nvd CVSS3.1
9.8
Vulnerability type
CWE-502
Deserialization of Untrusted Data
Published: 20 May 2026 · Updated: 30 May 2026 · First seen: 20 May 2026