CVE-2026-117995: Privilege escalation in the DOM: UI Events & Focus Handling component

Published Oct 27, 2026
·
Updated

Privilege escalation in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.

Affected Software

2 affected componentsFixes available
Mozilla Firefox ESR<153.6
153.6
Mozilla Firefox<159
159

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 153.6
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 159
  3. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 159
  4. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 153.6

Event History

Oct 27, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
CVE Published
via MITRE·02:05 PM
Data Sourced
via MITRE·02:05 PM
Description

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

Which Firefox releases contain the fix?

The issue was fixed in Firefox 159 and Firefox ESR 153.6.

2

How can I determine whether an installation still needs the update?

Check the installed Firefox version. Installations earlier than Firefox 159, or Firefox ESR installations earlier than 153.6, do not include the stated fix.

Company

Resources

Contact

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