Description
One of the web-mail accounts is using a weak password. Acunetix was able to guess the credentials required to access the service. A weak password is short, common, a system default, or something that could be rapidly guessed by executing a brute force attack using a subset of all possible passwords, such as words in the dictionary, proper names, words based on the user name or common variations on these themes.
Remediation
Enforce a strong password policy. Don't permit weak passwords or passwords based on dictionary words.
References
Related Vulnerabilities
WordPress 5.2.x Multiple Vulnerabilities (5.2 - 5.2.9)
Joomla! Core 3.0.x Information Disclosure (3.0.0 - 3.0.3)
WordPress 4.9.x Multiple Vulnerabilities (4.9 - 4.9.16)
WordPress Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2021-29450)
PostgreSQL Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2017-15098)