This update upgrades Thunderbird to version 52.5.0.
Security Fix(es):
* Multiple flaws were found in the processing of malformed web content. A
web page containing malicious content could cause Thunderbird to crash or,
potentially, execute arbitrary code with the privileges of the user
running Thunderbird. (CVE-2017-7826, CVE-2017-7828, CVE-2017-7830)
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