CVE-2026-8964

Spoofing issue in the Popup Blocker component

CVSS 7.5 HIGHEPSS 0.3%CWE-451

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.5EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

19 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

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References