vulnerability

Red Hat: CVE-2025-4083: firefox: thunderbird: Process isolation bypass using "javascript:" URI links in cross-origin frames (Multiple Advisories)

Name: Red Hat: CVE-2025-4083: firefox: thunderbird: Process isolation bypass using "javascript:" URI links in cross-origin frames (Multiple Advisories)
Creator: Red Hat
Published: 2025-04-29T00:00:00.000Z
Keywords: CVE, CWE-653, Red Hat, 2025, 4083, firefox, redhat-upgrade-firefox, redhat-upgrade-firefox-debuginfo, redhat-upgrade-firefox-debugsource, redhat-upgrade-firefox-x11, redhat-upgrade-thunderbird, redhat-upgrade-thunderbird-debuginfo, redhat-upgrade-thunderbird-debugsource, Severity 9

Try Surface Command

Back to search

Severity

CVSS

(AV:N/AC:M/Au:N/C:C/I:C/A:P)

Published

Apr 29, 2025

Added

May 6, 2025

Modified

Jun 17, 2026

Description

A process isolation vulnerability in Thunderbird 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. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.

Solutions

redhat-upgrade-firefoxredhat-upgrade-firefox-debuginforedhat-upgrade-firefox-debugsourceredhat-upgrade-firefox-x11redhat-upgrade-thunderbirdredhat-upgrade-thunderbird-debuginforedhat-upgrade-thunderbird-debugsource

References

Rapid7 Labs

2026 Global Threat Landscape Report

The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.

Get report