6.5
Medium
CVE-2026-57963 An attacker who can send HTML chat messages (via Matrix or XMPP) can inject arbitrary styled content, phishing links,…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Thunderbird 152.0 | earliest → < 152.0.1 | 152.0.1 |
| Thunderbird 140.12 | earliest → < 140.12.1 | 140.12.1 |
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