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An attacker who can send HTML chat messages (via Matrix...

Unreviewed Published Jul 1, 2026 to the GitHub Advisory Database • Updated Jul 1, 2026

Package

No package listed— Suggest a package

Affected versions

Unknown

Patched versions

Unknown

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.

References

Published by the National Vulnerability Database Jul 1, 2026
Published to the GitHub Advisory Database Jul 1, 2026
Last updated Jul 1, 2026

Severity

Unknown

EPSS score

Weaknesses

No CWEs

CVE ID

CVE-2026-57963

GHSA ID

GHSA-396p-jm6v-v2p3

Source code

No known source code

Dependabot alerts are not supported on this advisory because it does not have a package from a supported ecosystem with an affected and fixed version.

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