Bug 2495814 (CVE-2026-57963) - CVE-2026-57963 thunderbird: Chat UI manipulation by injection
Summary: CVE-2026-57963 thunderbird: Chat UI manipulation by injection
Keywords:
Status: NEW
Alias: CVE-2026-57963
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-01 02:01 UTC by OSIDB Bzimport
Modified: 2026-07-22 05:04 UTC (History)
5 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-07-01 02:01:27 UTC 
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.
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