Deserialization in Pixelyoursite Boost

CVE-2026-7637

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 attac…

Vulnerability class: Insecure Deserialization

EPSS: 0.001 (35.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-7637?
CVE-2026-7637 is a critical-severity vulnerability in Pixelyoursite Boost, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-05-20.
How severe is CVE-2026-7637?
Critical severity. CVSS v3 base score is 9.8 out of 10.