CVE-2025-4083

firefox: thunderbird: Process isolation bypass using "javascript:" URI links in cross-origin frames

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Severity

Important

Red Hat Product Security

8.3

CVSS 3.1

Review impact separately from score.

Published · April 29, 2025

Updated · June 28, 2026

Description

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: A process isolation vulnerability in Firefox stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape.

Statement

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 8.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

CWE-653 · Improper Isolation or Compartmentalization