Debian/thunderbird: medium 6.5
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
Action: Upgrade thunderbird to 1:140.13.0esr-1 or later.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 1:140.13.0esr-1 | - |
Fixed versions
| 1:140.13.0esr-1 |
Sources
- osv: DEBIAN-CVE-2026-57963#Debian:14/thunderbird
- https://security-tracker.debian.org/tracker/CVE-2026-57963
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