CVE-2026-57963

Chat UI manipulation by injection

CVSS 6.5 MEDIUMEPSS 0.2%CWE-79

Vexday Risk Score

13Baixo

Decisão SSVC (CISA)

Track

Sem sinal de exploração → monitorar

CVSS 6.5EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Ciclo de vida

01 jul 2026Publicada no NVD

Recomendação: Monitorar — sem sinal de exploração no momento.

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Produtos afetados

Mozilla · Thunderbird

Referências

https://bugzilla.mozilla.org/show_bug.cgi?id=2042910 https://www.mozilla.org/security/advisories/mfsa2026-63/https://www.mozilla.org/security/advisories/mfsa2026-64/