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CVE-2026-2780Privilege escalation in the Netmonitor component
- 8.8HighCVSS base score
- 0.40%Exploitation in 30 daysEPSS · top 66% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Timeline
ID reserved
By mozilla
- 5 days later
· 5 days later
Published
- 48 days later
· 48 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.40% · top 66% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
- unaffected 140.8 – ≤ 140.*
- unaffected 148 – ≤ *
- unaffected 140.8 – ≤ 140.*
- unaffected 148 – ≤ *
References
References5
- https://bugzilla.mozilla.org/show_bug.cgi?id=2007829 (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-13/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-15/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-16/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-17/ (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-8501 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-2780)Record last updated .