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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-57963] Chat UI manipulation by injection

This high-severity Red Hat Linux advisory covers CVE-2026-57963.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-57963 Source published Source updated

VulniPulse record published

CVE-2026-57963
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

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.

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H).

Weakness: CWE-79. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.

Is CVE-2026-57963 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-57963 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-57963?

Upgrade to a fixed release named by Red Hat:

  • 152.0.1
  • 140.12.1

Confirm against the vendor advisory before you patch.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 10 days ago·verify at source

Fixed versions
  • 152.0.1
  • 140.12.1

Official advisory · high-confidence parse· fetched 10 days ago·verify at source

Mitigation

Upgrade to a fixed release: 152.0.1, 140.12.1. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 10 days ago·verify at source

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