What’s Vulnerable › Vulnerabilities

CVE-2026-8960: Spoofing issue in WebExtensions

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-19 · updated 2026-10-14
• Weakness: CWE-290

Description

Spoofing issue in WebExtensions. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

Affected products

• Mozilla Firefox: before 151.0.0 — fixed in 151.0.0
• Mozilla Thunderbird: before 151.0.0 — fixed in 151.0.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 151.0.0; Mozilla Thunderbird 151.0.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1940116
• https://www.mozilla.org/security/advisories/mfsa2026-46/
• https://www.mozilla.org/security/advisories/mfsa2026-50/

Get alerted when CVE-2026-8960 or the next vulnerability affects your stack