Security vulnerabilities fixed in Thunderbird 52.5.2 — Mozilla

A buffer overflow occurs when drawing and validating elements using Direct 3D 9 with the ANGLE graphics library, used for WebGL content. This is due to an incorrect value being passed within the library during checks and results in a potentially exploitable crash. Note: This attack only affects Windows operating systems. Other operating systems are unaffected.
It is possible to execute JavaScript in the parsed RSS feed when RSS feed is viewed as a website, e.g. via “View -> Feed article -> Website” or in the standard format of “View -> Feed article -> default format”.
Crafted CSS in an RSS feed can leak and reveal local path strings, which may contain user name.
RSS fields can inject new lines into the created email structure, modifying the message body.
It is possible to spoof the sender’s email address and display an arbitrary sender address to the email recipient. The real sender’s address is not displayed if preceded by a null character in the display string.