Sourced from phpmailer/phpmailer's releases.

PHPMailer 6.5.0

This is a security release.

• SECURITY Fixes CVE-2021-34551, a complex RCE affecting Windows hosts. See https://github.com/PHPMailer/PHPMailer/blob/HEAD/SECURITY.md for details.
• The fix for this issue changes the way that language files are loaded. While they remain in the same PHP-like format, they are processed as plain text, and any code in them will not be run, including operations such as concatenation using the . operator.
• Deprecation The current translation file format using PHP arrays is now deprecated; the next major version will introduce a new format.
• SECURITY Fixes CVE-2021-3603 that may permit untrusted code to be run from an address validator. See https://github.com/PHPMailer/PHPMailer/blob/HEAD/SECURITY.md for details.
• The fix for this issue includes a minor BC break: callables injected into validateAddress, or indirectly through the $validator class property, may no longer be simple strings. If you want to inject your own validator, provide a closure instead of a function name.
• Haraka message ID strings are now recognised

Thanks to Vikrant Singh Chauhan, listensec.com, and the WordPress security team for reporting and assistance with this release.

Sourced from phpmailer/phpmailer's changelog.

Version 6.5.0 (June 16th, 2021)

• SECURITY Fixes CVE-2021-34551, a complex RCE affecting Windows hosts. See https://github.com/PHPMailer/PHPMailer/blob/master/SECURITY.md for details.
• The fix for this issue changes the way that language files are loaded. While they remain in the same PHP-like format, they are processed as plain text, and any code in them will not be run, including operations such as concatenation using the . operator.
• Deprecation The current translation file format using PHP arrays is now deprecated; the next major version will introduce a new format.
• SECURITY Fixes CVE-2021-3603 that may permit untrusted code to be run from an address validator. See https://github.com/PHPMailer/PHPMailer/blob/master/SECURITY.md for details.
• The fix for this issue includes a minor BC break: callables injected into validateAddress, or indirectly through the $validator class property, may no longer be simple strings. If you want to inject your own validator, provide a closure instead of a function name.
• Haraka message ID strings are now recognised

• a5b5c43 Changelog
• e121da3 Merge branch 'master' of https://github.com/PHPMailer/PHPMailer
• 74e512a Security update
• acd264b Merge branch 'CVE-2021-34551'
• 0063f83 Changelog
• 707205f Changelog
• 1047838 Changelog
• c2f191b Changelog
• 45f3c18 Deny string-based callables altogether
• 6334bab CVE docs
• Additional commits viewable in compare view

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