On Wednesday Adobe made available an out of band (un-scheduled) emergency update available for Photoshop CC for both Apple macOS and Windows systems.
Photoshop CC 2018 (versions 19.1.5 and earlier) and Photoshop 2017 (versions 18.1.5 and earlier) are affected by two critical memory corruption vulnerabilities. If an attacker were to exploit these they could achieve remote code execution (defined: the ability for an attacker to remotely carry out any action of their choice on your device). The vulnerabilities were responsibly disclosed (defined) by Kushal Arvind Shah of Fortinet’s FortiGuard Labs to Adobe.
Please follow the steps within Adobe’s security bulletin to install the applicable updates as soon as possible if you use these products.