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CRITICAL

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

Published Apr 29, 2025

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.

Affected products

Remediation

Red Hat statement

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

Weaknesses (1)

References (12)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mozilla
Published Apr 29, 2025
Updated Jul 25, 2026
Reserved Apr 29, 2025
CISA Vulnrichment
Updated Apr 30, 2025
NVD
Status Modified
Modified Oct 5, 2026
Red Hat
Severity Important
Public date Apr 29, 2025
ENISA EUVD
Assigner mozilla
Published Apr 29, 2025
Updated Jul 25, 2026
Exploited since n/a
EUVD-2025-12730