EUVD-2026-31045
GHSA-r5mf-5vch-2vpf
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
1DescriptionNVD
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.
AnalysisAI
PHP Object Injection in the Boost plugin for WordPress (versions up to and including 2.0.3) allows unauthenticated remote attackers to inject arbitrary PHP objects via the STYXKEY-BOOST_USER_LOCATION cookie. The vulnerability stems from unsafe deserialization of attacker-controlled cookie data; while the plugin itself ships no usable POP (property-oriented programming) chain, exploitation becomes high-impact when any other installed plugin or theme provides one. …
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RemediationAI
24 hours: Identify all WordPress installations running Boost ≤2.0.3 and document installed plugins/themes. 7 days: Implement WAF rules to block the STYXKEY-BOOST_USER_LOCATION cookie or disable Boost plugin pending patch availability. …
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