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Security Vulnerabilities fixed in Thunderbird 153.5 — Mozilla

🗓️ 13 Oct 2026 00:00:00Reported by Mozilla FoundationType 
mozilla
 mozilla
🔗 www.mozilla.org👁 3 Views

A malicious, compromised, or MITM-controlled Exchange server can return a single well-formed SOAP response containing an element with enough attributes to keep Thunderbird's main thread CPU-bound for seconds to hours.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
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CVE-2026-109704
13 Oct 202612:52
–circl
circl
Circl
CVE-2026-109705
13 Oct 202612:53
–circl
circl
Circl
CVE-2026-109706
13 Oct 202612:53
–circl
circl
Circl
CVE-2026-109707
13 Oct 202612:54
–circl
circl
Circl
CVE-2026-109708
13 Oct 202612:55
–circl
circl
Circl
CVE-2026-109709
13 Oct 202612:55
–circl
circl
Circl
CVE-2026-109710
13 Oct 202612:56
–circl
circl
Circl
CVE-2026-110249
13 Oct 202618:40
–circl
cve
CVE
CVE-2026-109704
13 Oct 202612:29
–cve
cve
CVE
CVE-2026-109705
13 Oct 202612:29
–cve
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13 Oct 2026 00:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.18.8
SSVC
3