CVE-2026-8962

HIGHNVD 8.1

8.1

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVSS v3: 8.1
EG Score: 0.0(none)
EPSS: 13.6%
KEV: Not listed

Published

May 19, 2026

Last Modified

May 20, 2026

References (5)

security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=2004804
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-46/
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-48/
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-50/
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-51/

Vendor Advisories for CVE-2026-8962(1)

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

GHSA-93x2-246x-h3jh
GitHub Security AdvisoriesHigh
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151 and...

Frequently asked(5)

What is CVE-2026-8962?

CVE-2026-8962 is a high vulnerability published on May 19, 2026. Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

When was CVE-2026-8962 disclosed?

CVE-2026-8962 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-2026-8962 actively exploited?

CVE-2026-8962 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 13.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-8962?

CVE-2026-8962 has a CVSS v3 base score of 8.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.

How do I remediate CVE-2026-8962?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8962, 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-2026-8962

📅 Published

🔄 Last Modified

🔗 References (5)

📣 Vendor Advisories for CVE-2026-8962(1)

❓ Frequently asked(5)