flask-mail
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Susceptible to starttls stripping attack when run on older Python versions (CVE-2016-0772)
smtplib
in old python versions doesn't check the response code of STARTTLS
, allowing a attacker to force cleartext communication, see https://github.com/tintinweb/pub/tree/master/pocs/cve-2016-0772 .
Patch in PR 135: https://github.com/mattupstate/flask-mail/pull/135