Use-After-Free Vulnerability in Firefox Affecting Window and Location Components
CVE-2026-2787

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
24 February 2026

What is CVE-2026-2787?

A use-after-free vulnerability exists in the DOM of Firefox, specifically within the Window and Location components. This flaw can lead to unexpected behavior or potential exploitation, impacting versions of Firefox prior to 148 and certain Extended Support Releases. It underscores the importance of maintaining updated software to protect against potential security risks.

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Affected Version(s)

Firefox < 148

Firefox ESR < 115.33

Firefox ESR < 140.8

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2014560
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-14/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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