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Mozilla Firefox CVE-2026-8966

| EUVD-2026-30918 HIGH
Information Exposure (CWE-200)
2026-05-19 mozilla GHSA-wq4p-4w8c-6qcg
7.5
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
May 20, 2026 - 17:26 vuln.today
CVSS changed
May 20, 2026 - 17:22 NVD
7.5 (HIGH)
CVE Published
May 19, 2026 - 12:30 nvd
UNKNOWN (no severity yet)

DescriptionNVD

Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 151.

AnalysisAI

Information disclosure in Mozilla Firefox versions prior to 151 affects the IP Protection component, allowing remote unauthenticated attackers to obtain sensitive information over the network without user interaction. The flaw carries a CVSS score of 7.5 driven entirely by confidentiality impact (C:H/I:N/A:N), and while no public exploit is identified at time of analysis, the very low EPSS score of 0.02% (4th percentile) suggests minimal active exploitation interest. …

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RemediationAI

Within 24 hours: Audit Firefox deployment across all systems and identify installations running versions prior to 151. Within 7 days: Deploy Firefox 151 or later via centralized update mechanisms to all endpoints. …

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Vendor StatusVendor

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CVE-2026-8966 vulnerability details – vuln.today

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