Privilege Escalation Vulnerability in Firefox by Mozilla
CVE-2026-2782

8.8HIGH

Key Information:

Vendor

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

What is CVE-2026-2782?

A vulnerability exists in the Netmonitor component of Firefox, which allows for privilege escalation. This affects versions of Firefox prior to 148 and Firefox ESR before 140.8, potentially allowing unauthorized access or manipulation within the affected systems. Users are urged to update their browsers to the latest versions to mitigate associated risks.

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Affected Version(s)

Firefox < 148

Firefox ESR < 140.8

Thunderbird < 148

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2010743
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-15/

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

Cody
JSON
.