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

Q: How do I fix CVE-2026-8945?

firefox: upgrade to 151.0.0; firefox focus: upgrade to 151.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-8945 being exploited?

CVE-2026-8945 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-8945 affect?

CVE-2026-8945 affects firefox, firefox focus. Severity is high (CVSS 7.5). Sandbox escape in Firefox and Firefox Focus for Android. This vulnerability was fixed in Firefox 151.

Routine

HIGH 7.5UPGRADEUPGRADE

CVE-2026-8945 is a high-severity flaw (CVSS 7.5) affecting firefox, firefox focus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-693, CWE-653
Published	2026-05-19
Last modified	2026-10-14

Publisher (CNA): Mozilla Corporation · Vendor: mozilla

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-19 14:16 UTCPublished CVE record published
2026-10-14 20:10 UTCUpdated Record last modified

mozilla firefox UPGRADE

Affected: < 151.0.0

Fixed in: 151.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy firefox || rpm -q firefox || firefox --version

2. UPGRADE to 151.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade firefox

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firefox

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

mozilla firefox focus UPGRADE

Affected: < 151.0

Fixed in: 151.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy firefox-focus || rpm -q firefox-focus || firefox-focus --version

2. UPGRADE to 151.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade firefox-focus

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firefox-focus

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-8945?

firefox: upgrade to 151.0.0; firefox focus: upgrade to 151.0. Exact commands for each OS are on this page.

Is CVE-2026-8945 being exploited?

CVE-2026-8945 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-8945 affect?

CVE-2026-8945 affects firefox, firefox focus. Severity is high (CVSS 7.5). Sandbox escape in Firefox and Firefox Focus for Android. This vulnerability was fixed in Firefox 151.

How urgent is CVE-2026-8945?

Priority 34/100. High severity

Software pages

Android vulnerabilities · Mozilla Firefox vulnerabilities

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References

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