CVE-2026-109756: Privilege escalation in the DOM: Navigation component

Published Oct 13, 2026
·
Updated

Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.

Affected Software

2 affected componentsFixes available
Mozilla Firefox<158
158
Mozilla Firefox ESR<153.5
153.5

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 158
  2. Upgrade

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

    Fixed in 153.5
  3. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 158
  4. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 153.5

Event History

Oct 13, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
CVE Published
via MITRE·12:29 PM
Data Sourced
via MITRE·12:29 PM
Description
Data Sourced
via NVD·01:17 PM
DescriptionSeverityWeakness

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What does an attacker need to exploit this issue?

The CVSS vector indicates the attacker can operate over the network, requires no prior privileges, and needs user interaction. The impact can include high confidentiality, integrity, and availability impact.

2

Which Firefox releases contain the fix?

Mozilla fixed the issue in Firefox 158 and Firefox ESR 153.5.

3

How should organizations determine whether they need to remediate?

Identify deployed Firefox and Firefox ESR versions and compare them with Firefox 158 and Firefox ESR 153.5, respectively. Systems that have not received these fixes should be prioritized for update.

Company

Resources

Contact

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