CVE-2026-8961

MEDIUMNVD 6.5

6.5

Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVSS v3: 6.5
EG Score: 0.0(none)
EPSS: 9.5%
KEV: Not listed

Published

May 19, 2026

Last Modified

May 20, 2026

References (5)

security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=1962625
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-2026-8961(1)

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

GHSA-5qxp-cr8v-39px
GitHub Security AdvisoriesMedium
Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151 and...

Frequently asked(5)

What is CVE-2026-8961?

CVE-2026-8961 is a medium vulnerability published on May 19, 2026. Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

When was CVE-2026-8961 disclosed?

CVE-2026-8961 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-2026-8961 actively exploited?

CVE-2026-8961 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-8961?

CVE-2026-8961 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.

How do I remediate CVE-2026-8961?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8961, 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-2026-8961

📅 Published

🔄 Last Modified

🔗 References (5)

📣 Vendor Advisories for CVE-2026-8961(1)

❓ Frequently asked(5)