CVE-2026-8948: Same-origin policy bypass in the DOM: Networking component

Published May 19, 2026
·
Updated

Same-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

Affected Software

4 affected componentsFixes available
Mozilla Firefox<151
151
Mozilla Thunderbird<151
151
Mozilla Firefox<151.0.0
Mozilla Thunderbird<151.0.0

Event History

May 19, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
Affected Software
CVE Published
via MITRE·12:29 PM
Data Sourced
via MITRE·12:29 PM
Description
Data Sourced
via NVD·02:16 PM
DescriptionSeverityWeaknessAffected Software
Jan 18, 58356
Event
via FIRST·02:34 AM
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Frequently Asked Questions

1

What is the severity of CVE-2026-8948?

CVE-2026-8948 is classified as a moderate severity vulnerability.

2

How do I fix CVE-2026-8948?

To fix CVE-2026-8948, users should upgrade to Firefox and Thunderbird version 151 or later.

3

What is CVE-2026-8948 about?

CVE-2026-8948 is a vulnerability that allows bypassing the same-origin policy in the DOM within certain Mozilla products.

4

Which versions are affected by CVE-2026-8948?

CVE-2026-8948 affects Mozilla Firefox and Thunderbird versions prior to 151.

5

Is CVE-2026-8948 exploitable remotely?

Yes, CVE-2026-8948 could potentially be exploited remotely by attackers to execute malicious actions.

Company

Resources

Contact

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CVE-2026-8948 - Same-origin policy bypass in the DOM: Networking component - SecAlerts