The KIWIZ Invoices Certification & PDF System WordPress plugin through 2.1.3 does not validate the path of files to be downloaded, which could allow unauthenticated attacker to read/downlaod arbitrary files, as well as perform PHAR unserialization (assuming they can upload a file on the server)
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Check my exposure →This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.