High 7.5Published May 19, 2026

CVE-2026-8960Spoofing issue in WebExtensions.

Updated under an hour ago (2026-10-19 08:50 UTC)

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It affects mozilla firefox and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-290
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

mozilla firefox mozilla:firefox	before 151.0.0	NVD
mozilla thunderbird mozilla:thunderbird	before 151.0.0	NVD

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.