CVE-2026-59544 CRITICAL

CVE-2026-59544: WordPress Thrive Quiz Builder plugin <= 10.9.3.0 - PHP Object Injection vulnerability

Vendor Thrive Themes Coupon

Product Thrive Quiz Builder

Weakness CWE-502 · Unsafe deserialization

Published July 23, 2026

Last update July 23, 2026

View on NVD All CVEs

CVSS base score

9.8/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality High

Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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

Explanation of Vulnerability in Simple Terms

02Summary

Thrive Quiz Builder versions up to 10.9.3.0 contain a deserialization vulnerability that allows unauthenticated attackers to run arbitrary code on the site. The vulnerability requires no user interaction and can be exploited remotely over the network. Site administrators should update immediately to a version newer than 10.9.3.0.

What an attacker can do

03Attacker Capabilities

Run arbitrary code on the site without authentication.

Potential impact on your site

04Site Impact

Complete compromise of the site, including data theft, malware injection, and site takeover.

Conditions required to exploit

05Prerequisites

Network access only; no authentication or user interaction required.

Key dates

06Disclosure timeline

July 23, 2026 CVE published

July 23, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-59544 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/502.html AskarLabs — CWE-502 write-up Deserialization of Untrusted Data

Related vulnerabilities

Identifiers

CVE CVE-2026-59544

CWE CWE-502

CVSS 9.8 / CRITICAL

Affected versions