Deserialization in User Profile Builder
CVE-2026-76547
The User Profile Builder WordPress plugin before 4.0.1 does not validate the type of data being deserialized when importing a configuration file, allowing high privilege users such as administrators to conduct PHP Object Injection. The affected feature is a free add-on which is disabled by default, and no POP chain is present in the User Profile Builder WordPress plugin before 4.0.1 itself, so further impact requires a suitable gadget from another installed User Profile Builder WordPress plugin before 4.0.1 or .
Vulnerability class: Insecure Deserialization
EPSS: 0.002 (13.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Unknown User Profile Builder
Weakness classification (CWE)
References
- contact@wpscan.com (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-76547?
- CVE-2026-76547 is a medium-severity vulnerability in User Profile Builder, classified under Deserialization of Untrusted Data. CVSS score: 6.6/10. Published 2026-08-29.
- How severe is CVE-2026-76547?
- Medium severity. CVSS v3 base score is 6.6 out of 10.