CVE-2020-5239

CVE-2020-5239 describes a critical vulnerability in Mailu versions prior to 1.7, specifically within its fetchmail script. An authenticated user can exploit this flaw to gain full access to a Mailu instance, making servers with open registration or untrusted users particularly vulnerable. The vulnerability carries a high CVSS score of 8.8, indicating a network-based attack with low complexity, requiring only low privileges, and leading to high impacts on confidentiality, integrity, and availability. While patches are available for affected versions and Docker images, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.