Question 1

What is CVE-2026-57963 — CVE-2026-57963?

Accepted Answer

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.

Question 2

What is the authoritative source for CVE-2026-57963?

Accepted Answer

CVE-2026-57963 (CVE-2026-57963) is catalogued in NVD + CISA KEV + FIRST EPSS and curated for EU compliance use cases by SQUR.

CVE-2026-57963CVE-2026-57963

Description

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