CVE-2026-57963 — Chat UI manipulation by injection
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 wa…
Published: 2026-07-01 · CVSS: 6.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7