Vulnerability Details CVE-2026-57963
An attacker who can send HTML chat messages (via Matrix or XMPP) can inject arbitrary styled content, phishing links, and CSS that manipulates the chat UI. This vulnerability was fixed in Thunderbird 152.0.1 and Thunderbird 140.12.1.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 9.1%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-57963
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cpe:2.3:a:mozilla:thunderbird:-
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cpe:2.3:a:mozilla:thunderbird:115.10.2
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cpe:2.3:a:mozilla:thunderbird:115.11.0
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cpe:2.3:a:mozilla:thunderbird:115.11.1
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cpe:2.3:a:mozilla:thunderbird:115.12.1
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cpe:2.3:a:mozilla:thunderbird:115.12.2
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cpe:2.3:a:mozilla:thunderbird:115.13.0
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cpe:2.3:a:mozilla:thunderbird:115.14.0
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cpe:2.3:a:mozilla:thunderbird:115.16.0
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cpe:2.3:a:mozilla:thunderbird:115.16.1
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cpe:2.3:a:mozilla:thunderbird:115.16.2
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cpe:2.3:a:mozilla:thunderbird:115.16.3
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cpe:2.3:a:mozilla:thunderbird:115.18.0
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cpe:2.3:a:mozilla:thunderbird:128.0.1
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cpe:2.3:a:mozilla:thunderbird:128.1.0
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cpe:2.3:a:mozilla:thunderbird:128.1.1
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cpe:2.3:a:mozilla:thunderbird:128.10.0
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cpe:2.3:a:mozilla:thunderbird:128.10.1
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cpe:2.3:a:mozilla:thunderbird:128.10.2
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cpe:2.3:a:mozilla:thunderbird:128.11.0
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cpe:2.3:a:mozilla:thunderbird:128.11.1
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cpe:2.3:a:mozilla:thunderbird:128.12.0
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cpe:2.3:a:mozilla:thunderbird:128.13.0
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cpe:2.3:a:mozilla:thunderbird:128.14.0
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cpe:2.3:a:mozilla:thunderbird:128.2.0
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cpe:2.3:a:mozilla:thunderbird:128.2.1
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cpe:2.3:a:mozilla:thunderbird:128.2.2
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cpe:2.3:a:mozilla:thunderbird:128.2.3
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cpe:2.3:a:mozilla:thunderbird:128.3.0
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cpe:2.3:a:mozilla:thunderbird:128.3.1
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cpe:2.3:a:mozilla:thunderbird:128.3.2
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cpe:2.3:a:mozilla:thunderbird:128.3.3
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cpe:2.3:a:mozilla:thunderbird:128.4.0
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cpe:2.3:a:mozilla:thunderbird:128.4.1
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cpe:2.3:a:mozilla:thunderbird:128.4.2
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cpe:2.3:a:mozilla:thunderbird:128.4.3
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cpe:2.3:a:mozilla:thunderbird:128.4.4
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cpe:2.3:a:mozilla:thunderbird:128.5.0
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cpe:2.3:a:mozilla:thunderbird:128.5.1
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cpe:2.3:a:mozilla:thunderbird:128.5.2
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cpe:2.3:a:mozilla:thunderbird:128.6.0
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cpe:2.3:a:mozilla:thunderbird:128.7.0
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cpe:2.3:a:mozilla:thunderbird:128.7.1
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cpe:2.3:a:mozilla:thunderbird:128.8.0
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cpe:2.3:a:mozilla:thunderbird:128.8.1
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cpe:2.3:a:mozilla:thunderbird:128.9.0
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cpe:2.3:a:mozilla:thunderbird:128.9.1
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cpe:2.3:a:mozilla:thunderbird:128.9.2
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cpe:2.3:a:mozilla:thunderbird:135.0
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cpe:2.3:a:mozilla:thunderbird:139.0
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cpe:2.3:a:mozilla:thunderbird:140.0
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cpe:2.3:a:mozilla:thunderbird:140.0.1
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cpe:2.3:a:mozilla:thunderbird:140.1.0
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cpe:2.3:a:mozilla:thunderbird:140.1.1
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cpe:2.3:a:mozilla:thunderbird:140.10.1
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cpe:2.3:a:mozilla:thunderbird:140.2.0
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cpe:2.3:a:mozilla:thunderbird:140.2.1
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cpe:2.3:a:mozilla:thunderbird:140.3.0
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cpe:2.3:a:mozilla:thunderbird:140.3.1
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cpe:2.3:a:mozilla:thunderbird:140.4.0
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cpe:2.3:a:mozilla:thunderbird:140.5.0
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cpe:2.3:a:mozilla:thunderbird:140.6.0
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cpe:2.3:a:mozilla:thunderbird:140.7.0
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cpe:2.3:a:mozilla:thunderbird:140.8.1
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cpe:2.3:a:mozilla:thunderbird:140.9.0
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cpe:2.3:a:mozilla:thunderbird:140.9.1
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cpe:2.3:a:mozilla:thunderbird:141.0
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cpe:2.3:a:mozilla:thunderbird:142.0
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cpe:2.3:a:mozilla:thunderbird:143.0
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cpe:2.3:a:mozilla:thunderbird:143.0.1
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cpe:2.3:a:mozilla:thunderbird:144.0
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cpe:2.3:a:mozilla:thunderbird:144.0.1
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cpe:2.3:a:mozilla:thunderbird:145.0
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cpe:2.3:a:mozilla:thunderbird:146.0
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cpe:2.3:a:mozilla:thunderbird:146.0.1
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cpe:2.3:a:mozilla:thunderbird:147.0
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cpe:2.3:a:mozilla:thunderbird:148.0.1
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cpe:2.3:a:mozilla:thunderbird:149.0
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cpe:2.3:a:mozilla:thunderbird:149.0.2