CVE-2026-57963

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CVSS 3.1

6.5 medium

EPSS

<1%p9

Published

Jul 1, 2026 (Jul 1, 2026)

Modified

Jul 6, 2026

Description

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.

Vendors: mozilla
Products: thunderbird
Weakness: CWE-79
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.2%)

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