CVE-2025-49401: 
WordPress vulnerability analysis and mitigation

CVE-2025-49401 is a Deserialization of Untrusted Data vulnerability discovered in ExpressTech Systems' Quiz And Survey Master WordPress plugin. The vulnerability affects versions up to and including 10.2.5. This security issue was disclosed on September 5, 2025, and received a critical CVSS v3.1 base score of 9.8 (Patchstack, NVD).

The vulnerability is classified as CWE-502 (Deserialization of Untrusted Data) and allows for PHP Object Injection through the deserialization of untrusted input. The vulnerability is particularly severe as it requires no authentication and has a low attack complexity, as indicated by its CVSS vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (Rapid7).

The vulnerability could potentially allow unauthenticated attackers to inject PHP Objects. While no known POP (Property-Oriented Programming) chain is present in the vulnerable software itself, if a POP chain exists via additional plugins or themes installed on the target system, attackers could potentially delete arbitrary files, retrieve sensitive data, or execute arbitrary code (Rapid7).

As of the disclosure date, no official fix is available for this vulnerability. Patchstack has issued a virtual patch to mitigate this issue by blocking potential attacks until an official fix becomes available. Website administrators are advised to implement immediate mitigation measures (Patchstack).