Search/CVE-2026-8401
● CVE — Critical

CVE-2026-8401

VendormozillaProductfirefoxDiscoveredMay 12, 2026UpdatedOct 26, 2026

Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

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CVSS v3.1
9.8 CRITICAL
EPSS
0.31%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Sep 25, 2026 → Oct 26, 2026
▼ 0.28pp
0.60% → 0.31% over 2 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
ConfidentialityHIGH
IntegrityHIGH
AvailabilityHIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Connections
3 relationships
Timeline
disclosure → media coverage
May 12, 2026
Disclosure — published as a CVE record. · last revised by NVD Oct 26, 2026