An anonymous reader quotes a report from WordPress Tavern: Authorities have not yet identified the hacker behind the Panama Papers breach, nor have they isolated the exact attack vector. It is clear that Mossack Fonseca, the Panamanian law firm that protected the assets of the rich and powerful by setting up shell companies, had employed a dangerously loose policy towards web security and communications. The firm ran its unencrypted emails through an outdated (2009) version of Microsoft's Outlook Web Access. Outdated open source software running the frontend of the firm's websites is also now suspected to have provided a vector for the compromise. Forbes has identified outdated WordPress and Drupal installations as security holes that may have led to the data leak. [WordPress Tavern Editor Sarah Gooding] found that the firm's WordPress-powered site is currently running on version 4.1 (released in December 2014), based on its version of autosave.js, which is identical to the autosave.js file shipped in 4.1. The main site is also loading a number of outdated scripts and plugins. Its active theme is a three-year-old version of Twenty Eleven (1.5), which oddly resides in a directory labeled for /twentyten/. The Mossack Fonseca client portal changelog.txt file is public, showing that its Drupal installation hasn't been updated for three years. Since the release of version 7.23, the software has received 25 security updates, which means that the version it is running includes highly critical known vulnerabilities that could have given the hacker access to the server.