PT-2026-54448 · Mozilla · Thunderbird
Michael Bommarito
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Published
2026-07-01
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Updated
2026-07-01
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CVE-2026-57963
None
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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.
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Related Identifiers
Affected Products
Thunderbird