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CVE-2026-57963
Chat UI manipulation by injection
Overview
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.

Details
INFO

Published Date :

July 1, 2026, 12:58 a.m.

Last Modified :

July 1, 2026, 12:58 a.m.

Remotely Exploit :

No

Source :

mozilla
Impact
Affected Products

The following products are affected by CVE-2026-57963 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Mozilla thunderbird
: Total Affected Vendor : 1 | Products : 1
Solution
Update to patched versions to prevent HTML injection and UI manipulation.
  • Update Thunderbird to version 152.0.1 or later.
  • Update Thunderbird to version 140.12.1 or later.
  • Avoid processing untrusted HTML content in chat messages.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-57963 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.