CVE-2025-14331: Same-origin policy bypass in the Request Handling component

Published Dec 9, 2025
·
Updated

Same-origin policy bypass in the Request Handling component. This vulnerability affects Firefox < 146, Firefox ESR < 115.31, and Firefox ESR < 140.6.

Other sources

Same-origin policy bypass in the Request Handling component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

— MITRE

Affected Software

12 affected componentsFixes available
Mozilla Firefox<146
Mozilla Firefox ESR<115.31, <140.6
Mozilla Firefox ESR<115.31
115.31
Mozilla Firefox ESR<140.6
140.6
Mozilla Firefox<146
146
Mozilla Thunderbird<146
146
Mozilla Thunderbird<140.6
140.6
Mozilla Firefox<115.31.0
Mozilla Firefox<146.0
Mozilla Firefox>=116.0<140.6.0
Mozilla Thunderbird<140.6.0
Mozilla Thunderbird<146.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 115.31
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 140.6
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 146
  4. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 146
  5. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 115.31
  6. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 140.6
  7. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 146
  8. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 140.6

Event History

Dec 9, 2025
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·01:38 PM
Data Sourced
via MITRE·01:38 PM
Description
Data Sourced
via Red Hat·02:02 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·04:17 PM
DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of CVE-2025-14331?

CVE-2025-14331 is classified as a high severity vulnerability due to its potential impact on user privacy and security.

2

How do I fix CVE-2025-14331?

To fix CVE-2025-14331, users should update Firefox to version 146 or later, or Firefox ESR to version 115.31 or later.

3

What does CVE-2025-14331 affect?

CVE-2025-14331 affects versions of Firefox prior to 146 and Firefox ESR prior to 115.31 and 140.6.

4

What is the nature of the vulnerability in CVE-2025-14331?

CVE-2025-14331 is a same-origin policy bypass vulnerability in the Request Handling component.

5

Who is impacted by CVE-2025-14331?

Individuals using affected versions of Firefox or Firefox ESR are at risk due to CVE-2025-14331.

Company

Resources

Contact

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