CVE-2026-92019

HIGH 8.1

Mitigation bypass in the Remote Settings Client component

CVSS Score

8.1

EPSS Score

0.2%

EPSS Percentile

6th

Mitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

Vendor	mozilla
Product	firefox
Ecosystems	Browser JavaScript
Industries	Technology
Published	Sep 15, 2026
Last Updated	Sep 21, 2026

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Affected Versions

Mozilla / Firefox

All versions affected

Mozilla / Thunderbird

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2065636 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-90/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-91/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-92/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-93/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-94/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-95/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-96/

Credits

Shu Takahashi