CVE-2025-39503: 
WordPress vulnerability analysis and mitigation

A Deserialization of Untrusted Data vulnerability (CVE-2025-39503) was discovered in GoodLayers Goodlayers Hotel WordPress plugin affecting versions through 3.1.4. The vulnerability was reported on January 29, 2025, and publicly disclosed on May 20, 2025. This security issue allows for Object Injection in the affected software (Patchstack).

The vulnerability has been assigned a CVSS v3.1 base score of 9.8 (Critical) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. This indicates that the vulnerability can be exploited over the network, requires low attack complexity, needs no privileges or user interaction, and can result in high impacts to confidentiality, integrity, and availability. The vulnerability is classified as CWE-502 (Deserialization of Untrusted Data) (NVD, Patchstack).

The PHP Object Injection vulnerability could potentially allow malicious actors to execute code injection, SQL injection, path traversal, and denial of service attacks if a proper POP chain is present. The high CVSS score of 9.8 indicates that this vulnerability is highly dangerous and is expected to become mass exploited (Patchstack).

Currently, no official fix is available for this vulnerability. However, Patchstack has issued a virtual patch to mitigate this issue by blocking potential attacks until an official fix becomes available. Website owners are advised to implement mitigation measures immediately (Patchstack).