Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade firefoxUpgrade thunderbirdUpgrade firefox-x11 | Dec 15, 2025 | Dec 10, 2025 |
| Amazon Linux Ami 2 | — | Upgrade firefoxUpgrade thunderbird | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade firefox | Jan 12, 2026 | Dec 9, 2025 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Dec 12, 2025 | Dec 12, 2025 |
| Freebsd | — | Upgrade thunderbirdUpgrade firefox-esrUpgrade firefox | Jan 27, 2026 | Dec 11, 2025 |
| Mfsa2025 92 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 146.0 | Dec 10, 2025 | Dec 9, 2025 |
| Mfsa2025 94 | — | Upgrade to Mozilla Firefox ESR version 140.6Upgrade to the latest version of Mozilla Firefox | Dec 10, 2025 | Dec 9, 2025 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 140.6Upgrade to the latest version of Mozilla Thunderbird | Dec 11, 2025 | Dec 9, 2025 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbirdUpgrade firefox-x11 | Dec 11, 2025 | Dec 9, 2025 |
| Redhat_linux | — | Upgrade firefox-debugsourceUpgrade firefoxNo solution existsUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade thunderbirdUpgrade firefox-x11 | Dec 11, 2025 | Dec 9, 2025 |
| Rocky_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade firefox-x11Upgrade firefox-debugsource | Jan 6, 2026 | Jan 5, 2026 |
| Ubuntu | — | Upgrade thunderbird | Feb 4, 2026 | Feb 2, 2026 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub