Merge remote-tracking branch 'private/thunderbird-91.1'

announce/2021/mfsa2021-41.yml

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+## mfsa2021-41.yml
+announced: September 7, 2021
+impact: low
+fixed_in:
+- Firefox ESR 91.1
+title: Security Vulnerabilities fixed in Thunderbird 91.1
+advisories:
+  CVE-2021-38492:
+    title: 'Navigating to `mk:` URL scheme could load Internet Explorer'
+    impact: moderate
+    reporter: James Lee
+    description: |
+      When delegating navigations to the operating system, Thunderbird would accept the `mk` scheme which might allow attackers to launch pages and execute scripts in Internet Explorer in unprivileged mode.
+      <br>*This bug only affects Thunderbird for Windows. Other operating systems are unaffected.*
+    bugs:
+      - url: 1721107
+  CVE-2021-38495:
+    title: Memory safety bugs fixed in Thunderbird 91.1
+    impact: high
+    reporter: Mozilla developers and community
+    description: |
+      Mozilla developers Tyson Smith, Christian Holler, and Gabriele Svelto reported memory safety bugs present in Thunderbird 78.13.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
+    bugs:
+      - url: 1723391, 1723920, 1724101, 1724107
+        desc: Memory safety bugs fixed in Thunderbird 91.1

announce/2021/mfsa2021-42.yml

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+## mfsa2021-42.yml
+announced: September 7, 2021
+impact: moderate
+fixed_in:
+- Thunderbird 78.14
+title: Security Vulnerabilities fixed in Thunderbird 78.14
+advisories:
+  CVE-2021-38492:
+    title: 'Navigating to `mk:` URL scheme could load Internet Explorer'
+    impact: moderate
+    reporter: James Lee
+    description: |
+      When delegating navigations to the operating system, Thunderbird would accept the `mk` scheme which might allow attackers to launch pages and execute scripts in Internet Explorer in unprivileged mode.
+      <br>*This bug only affects Thunderbird for Windows. Other operating systems are unaffected.*
+    bugs:
+      - url: 1721107
+  CVE-2021-38493:
+    title: Memory safety bugs fixed in Thunderbird 78.14 and Thunderbird 91.1
+    impact: high
+    reporter: Mozilla developers and community
+    description: |
+      Mozilla developers Tyson Smith and Gabriele Svelto reported memory safety bugs present in Thunderbird 78.13. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
+    bugs:
+      - url: 1723391, 1724101, 1724107
+        desc: Memory safety bugs fixed in Thunderbird 78.14 and Thunderbird 91.1