CVE-2026-7637
The Boost plugin for WordPress is vulnerable to PHP Object Injection in versions up to 2.0.3 via a cookie. This flaw allows attackers to inject arbitrary PHP objects, but it only becomes dangerous if another plugin or theme provides a vulnerable chain. The vulnerability is rated critical due to the potential for complete compromise if a POP chain exists.
No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.
Who is affected
WordPress sites using the Boost plugin version 2.0.3 or earlier.
Real-world impact
An attacker could delete files, read sensitive data, or execute code on the site if a vulnerable plugin or theme that contains a POP chain is also installed.
Why this severity
The CVSS score of 9.8 reflects the high impact on confidentiality, integrity, and availability, and the fact that the flaw can be exploited without authentication or user interaction.
What to do about it
- ›Avoid using the Boost plugin or ensure no other plugins or themes with vulnerable POP chains are installed.
No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.
No fix documented in sources
Timeline
- May 20, 2026 · May 20, 2026PublishedDisclosed and added to the National Vulnerability Database.
- Jul 24, 2026 · 12d agoAdvisory updatedThe NVD record was last revised.