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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Mozilla Thunderbird affected
Version Status Constraints
140.12.1 unaffected ≤ 140.*
152.0.1 unaffected ≤ *

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://bugzilla.mozilla.org/show_bug.cgi?id=2042910 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-62/ cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-63/ cve-icon
History

Wed, 01 Jul 2026 03:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-79

Wed, 01 Jul 2026 01:30:00 +0000

Type Values Removed Values Added
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.
Title Chat UI manipulation by injection
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-07-01T00:58:33.922Z

Reserved: 2026-06-26T15:27:32.832Z

Link: CVE-2026-57963

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

Updated: 2026-07-01T03:15:15Z

Weaknesses