Some vulnerabilities have been reported in Thunderbird, which can be exploited by malicious people to bypass certain security restrictions, conduct cross-site scripting attacks, potentially disclose sensitive information, and potentially compromise a user's system.
Also, see #1, #15, #16, #18, #19, #20, and #22 in: SA19631
The following weakness and vulnerability have also been reported:
1) An error caused due to certain references to external resources being followed can be exploited to validate the existence of an mail address when a malicious mail is opened using e.g. CSS or an iframe included in-line.
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Subject: Thunderbird Multiple Vulnerabilities
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