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Thunderbird 91.5.0 Stable is a security update that addresses several issues in the open source email client.The new version of Thunderbird Stable is already available. It is pushed to user systems, provided that automatic updating has not been disabled.

Thunderbird users may run manual checks for updates to install the update early. Select Help > About Thunderbird to display the installed version and have Thunderbird run a check for updates manually. Users who don't see the menubar need to press the Alt-key on the keyboard to display it.

The official release notes list just three entries: two refer to fixed issues in the email client, one links to the security advisories page, which details the fixed security issues in the client.

The two non-security issues that were fixed address a display issue for RSS keyword labels and missing information on Thunderbird's about dialog page.

The security advisories page for Thunderbird 91.5 lists 14 security issues, many of which come from the code that Thunderbird shares with the Firefox web browser.

The highest severity rating of all vulnerabilities is high, second only to the critical rating. Here is the full list of security issues patched in the new Thunderbird version:

1. CVE-2022-22746: Calling into reportValidity could have lead to fullscreen window spoof
   
2. CVE-2022-22743: Browser window spoof using fullscreen mode
   
3. CVE-2022-22742: Out-of-bounds memory access when inserting text in edit mode
   
4. CVE-2022-22741: Browser window spoof using fullscreen mode
   
5. CVE-2022-22740: Use-after-free of ChannelEventQueue::mOwner
   
6. CVE-2022-22738: Heap-buffer-overflow in blendGaussianBlur
   
7. CVE-2022-22737: Race condition when playing audio files
   
8. CVE-2021-4140: Iframe sandbox bypass with XSLT
   
9. CVE-2022-22748: Spoofed origin on external protocol launch dialog
   
10. CVE-2022-22745: Leaking cross-origin URLs through securitypolicyviolation event
    
11. CVE-2022-22744: The 'Copy as curl' feature in DevTools did not fully escape website-controlled data, potentially leading to command injection
    
12. CVE-2022-22747: Crash when handling empty pkcs7 sequence
    
13. CVE-2022-22739: Missing throttling on external protocol launch dialog
    
14. CVE-2022-22751: Memory safety bugs fixed in Thunderbird 91.5
    

Now You: do you use Thunderbird? What would you like to see supported?
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