CVE-2026-8964 — HIGH (7.5) — White Hats Nepal

Q: What is CVE-2026-8964?

CVE-2026-8964 is a vulnerability with a CVSS score of 7.5 (HIGH). Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

Q: How severe is CVE-2026-8964?

CVE-2026-8964 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-8964?

Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Thunderbird.

Vulnerability Description

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

CVSS Score

7.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Mozilla	Firefox	< 151.0.0
Mozilla	Thunderbird	< 151.0.0

Related Weaknesses (CWE)

CWE-451

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2025170Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-46/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-50/Vendor Advisory

FAQ

What is CVE-2026-8964?

CVE-2026-8964 is a vulnerability with a CVSS score of 7.5 (HIGH). Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

How severe is CVE-2026-8964?

CVE-2026-8964 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-8964?

Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Thunderbird.