CVE-2026-7637
CWE-502Published: May 20, 2026· Updated: May 20, 2026
Official 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.
Risk Analysis
This critical PHP Object Injection vulnerability in the Boost plugin for WordPress allows unauthenticated attackers to inject PHP Objects. With a CVSS score of 9.8, this flaw could lead to severe consequences like arbitrary file deletion, sensitive data retrieval, or code execution if a suitable POP chain exists in another installed plugin or theme. This vulnerability is remotely exploitable.
No public exploit is currently known for this vulnerability. Its remote exploitability and lack of authentication make it a significant risk, especially if other vulnerable plugins are present.
Upgrade the Boost plugin for WordPress to a version beyond 2.0.3. Regularly audit your WordPress installation for outdated plugins and themes, and ensure all components are kept up-to-date.
Technical Analysis
CVE-2026-7637 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
From a weakness classification perspective (CWE-502): Insecure deserialization vulnerabilities allow attackers to inject malicious objects during deserialization, potentially enabling remote code execution.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
All References (2)
Quick Facts
Related CVEs (CWE-502)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-7637 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts