compose.php in SquirrelMail 1.4.22 calls unserialize for the $mailtodata value, which originates from an HTTP GET request. This is related to mailto.php.
{ "binaries": [ { "binary_version": "2:1.4.23~svn20120406-2+deb8u3ubuntu0.14.04.1~esm1", "binary_name": "squirrelmail" } ] }
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-14932.json"
{ "binaries": [ { "binary_version": "2:1.4.23~svn20120406-2+deb8u3ubuntu0.16.04.2", "binary_name": "squirrelmail" } ] }