CVE-2025-4083
First published: Tue Apr 29 2025(Updated: )
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. This vulnerability affects Firefox < 138, Firefox ESR < 128.10, Firefox ESR < 115.23, Thunderbird < 138, and Thunderbird ESR < 128.10.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Firefox | <138 | |
| Firefox ESR | <128.10<115.23 | |
| Thunderbird | <138 | |
| Mozilla Thunderbird | <128.10 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1958350
- https://www.mozilla.org/security/advisories/mfsa2025-28/
- https://www.mozilla.org/security/advisories/mfsa2025-29/
- https://www.mozilla.org/security/advisories/mfsa2025-30/
- https://www.mozilla.org/security/advisories/mfsa2025-31/
- https://www.mozilla.org/security/advisories/mfsa2025-32/
Frequently Asked Questions
What is the severity of CVE-2025-4083?
CVE-2025-4083 has been classified as a high severity vulnerability due to its potential to allow sandbox escape.
How do I fix CVE-2025-4083?
To mitigate CVE-2025-4083, users should update Firefox and Thunderbird to versions 138 or later and Firefox ESR to versions 128.10 or later.
What impact does CVE-2025-4083 have on users?
CVE-2025-4083 could enable malicious content to execute in the top-level document's process, compromising user security.
Which versions of Firefox are affected by CVE-2025-4083?
CVE-2025-4083 affects Firefox versions earlier than 138 and Firefox ESR versions earlier than 128.
Does CVE-2025-4083 affect Thunderbird?
Yes, CVE-2025-4083 affects Thunderbird versions prior to 138 and Thunderbird ESR versions prior to 128.10.
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