CVE-2026-8971
Medium
Description
Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Mozilla Firefox
PublishedMay 19, 2026
First seenMay 19, 2026
Weakness typeCWE-346CWE-346
How to fix
Update
- mozilla firefox151.0.0 or later
- mozilla thunderbird151.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 151.0.0 | 151.0.0 |
| mozilla thunderbird | v < 151.0.0 | 151.0.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.