CVE-2026-8966

HIGHNVD 7.5

7.5

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

CVSS v3: 7.5
EG Score: 0.0(none)
EPSS: 9.2%
KEV: Not listed

Published

May 19, 2026

Last Modified

May 20, 2026

References (3)

security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=2025849
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-46/
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-50/

Vendor Advisories for CVE-2026-8966(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

GHSA-wq4p-4w8c-6qcg
GitHub Security AdvisoriesHigh
Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 151.

Frequently asked(5)

What is CVE-2026-8966?

CVE-2026-8966 is a high vulnerability published on May 19, 2026. Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

When was CVE-2026-8966 disclosed?

CVE-2026-8966 was first published in the National Vulnerability Database on May 19, 2026, with the most recent update on May 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-8966 actively exploited?

CVE-2026-8966 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-8966?

CVE-2026-8966 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.

How do I remediate CVE-2026-8966?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8966, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2026-8966

📅 Published

🔄 Last Modified

🔗 References (3)

📣 Vendor Advisories for CVE-2026-8966(1)

❓ Frequently asked(5)