The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: libphp-phpmailer 5.2.14+dfsg-2.3+deb9u2ubuntu0.1~esm2 Ubuntu 16.04 ESM: libphp-phpmailer 5.2.14+dfsg-1ubuntu0.1~esm2 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5956-2
https://ubuntu.com/security/notices/USN-5956-1
CVE-2017-11503
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