CVE-2025-6425
Medium
Description
An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
SeverityMedium
CVSS4.3
Exploit probability—
Product
Mozilla Firefox
PublishedJun 24, 2025
First seenJun 24, 2025
Weakness typeCWE-200Sensitive information exposure
How to fix
Update
- mozilla firefox115.25.0, 140.0, 128.12.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 115.25.0, v < 140.0, 116.0 ≤ v < 128.12.0 | 115.25.0, 140.0, 128.12.0 |
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