CVE-2026-16396
HIGH
8.8
CVSS 3.1
Description
Privilege escalation in WebExtensions. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
Metadata
Severity & Metrics
8.8
HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC — CISA Coordinator
Affected products (2)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| Mozilla | Firefox | — | 140.13 ≤ 140.*, 153 ≤ * |
| Mozilla | Thunderbird | — | 140.13 ≤ 140.*, 153 ≤ * |
Weakness (CWE)
| CWE | Source | Description |
|---|---|---|
| CWE-269 | adp | CWE-269 Improper Privilege Management |
CVSS scores (1)
| Score | Severity | Version | Source | Vector |
|---|---|---|---|---|
| 8.8 | HIGH | 3.1 | adp | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
References (5)