CVE-2026-8945: Sandbox escape in Firefox and Firefox Focus for Android

High severity · published May 19, 2026

CVE-2026-8945

Sandbox escape in Firefox and Firefox Focus for Android

7.5

CVSS

0.4%

EPSS

On KEV

Description

Sandbox escape in Firefox and Firefox Focus for Android. This vulnerability was fixed in Firefox 151.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack vector

Network

Complexity

High

Privileges

None

User interaction

Required

Confidentiality

High

Integrity

High

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.4% · higher than 31% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Firefox · Mozilla

before 151.0.0 · source: NVD

Firefox Focus · Mozilla

before 151.0 · source: NVD

Affected product

Firefox

Mozilla

All Firefox CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-8945

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-8945

Permissions Required

https://bugzilla.mozilla.org/show_bug.cgi?id=2003171

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-46/

access.redhat.com

https://access.redhat.com/security/cve/CVE-2026-8945

bugzilla.redhat.com

https://bugzilla.redhat.com/show_bug.cgi?id=2479863

security.access.redhat.com

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8945.json