What is CVE-2026-59544?

CVE-2026-59544 is a critical-severity vulnerability in Thrive Themes Coupon Quiz Builder, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-23.

How severe is CVE-2026-59544?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Thrive Themes Coupon Quiz Builder

CVE-2026-59544

Unauthenticated PHP Object Injection in Thrive Quiz Builder <= 10.9.3.0 versions.

Vulnerability class: Insecure Deserialization

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

Thrive Themes Coupon Quiz Builder — versions n/a

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

audit@patchstack.com (vdb-entry)

Frequently asked questions

What is CVE-2026-59544?: CVE-2026-59544 is a critical-severity vulnerability in Thrive Themes Coupon Quiz Builder, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-23.
How severe is CVE-2026-59544?: Critical severity. CVSS v3 base score is 9.8 out of 10.