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Security Vulnerabilities fixed in Thunderbird 153.5.1 — Mozilla

🗓️ 20 Oct 2026 00:00:00Reported by Mozilla FoundationType 
mozilla
 mozilla
🔗 www.mozilla.org👁 4 Views

Thunderbird flaws allow password theft, stanza injection, and memory disclosure.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-113470
20 Oct 202613:09
–circl
circl
Circl
CVE-2026-113866
20 Oct 202619:28
–circl
circl
Circl
CVE-2026-113867
20 Oct 202619:29
–circl
circl
Circl
CVE-2026-113868
20 Oct 202619:30
–circl
cve
CVE
CVE-2026-113470
20 Oct 202612:58
–cve
cve
CVE
CVE-2026-113866
20 Oct 202619:14
–cve
cve
CVE
CVE-2026-113867
20 Oct 202619:14
–cve
cve
CVE
CVE-2026-113868
20 Oct 202619:14
–cve
cvelist
Cvelist
CVE-2026-113470 Cryptographic issue in the Security Block-lists, Allow-lists, and other State component
20 Oct 202612:58
–cvelist
cvelist
Cvelist
CVE-2026-113866 Account password sent unencrypted during Exchange account setup
20 Oct 202619:14
–cvelist
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mozillathunderbirdRange<153.5.1

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20 Oct 2026 00:00Current
6.2Medium risk
Vulners AI Score6.2
CVSS 3.15.4
SSVC
4