CVE-2026-12313
Medium
Description
Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
SeverityMedium
CVSS4.7
Exploit probability—
Product
Mozilla Firefox
PublishedJun 16, 2026
First seenJun 16, 2026
Weakness typeCWE-269Improper privilege management
How to fix
Update
- mozilla firefox152.0, 140.12.0 or later
- mozilla thunderbird152.0.0, 140.12.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 152.0, 140.0 ≤ v < 140.12.0 | 152.0, 140.12.0 |
| mozilla thunderbird | v < 152.0.0, 140.0 ≤ v < 140.12.0 | 152.0.0, 140.12.0 |
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