CVE-2025-13543 is a vulnerability in the PostGallery plugin for WordPress caused by incorrect validation of uploaded file types in the 'PostGalleryUploader' class. Authenticated users with subscriber-level or higher permissions can exploit this to upload arbitrary files, potentially leading to remote code execution. The issue affects all versions up to and including 1.12.5. There is no vendor-provided patch or advisory available at this time, and no known exploits have been reported in the wild.

Successful exploitation allows an authenticated attacker with subscriber-level or higher permissions to upload arbitrary files to the server hosting the vulnerable WordPress site. This can lead to remote code execution, compromising confidentiality, integrity, and availability of the affected system. The CVSS 3.1 base score of 8.8 reflects the high impact and ease of exploitation given low attack complexity and no user interaction required.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict user permissions to trusted users only and consider disabling or removing the PostGallery plugin if possible. Monitor for updates from the vendor or WordPress plugin repository to apply an official patch once available.