CVE-2026-92062: Privilege escalation in the Session Restore component

Published Sep 15, 2026
·
Updated

Privilege escalation in the Session Restore component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

Affected Software

10 affected componentsFixes available
Mozilla Firefox>156, >153.3
Mozilla Firefox ESR>153.3
Mozilla Firefox<156
156
Mozilla Firefox ESR<153.3
153.3
Mozilla Thunderbird<156
156
Mozilla Thunderbird<153.3
153.3
Mozilla Firefox<153.3.0
Mozilla Firefox>=154.0.0<156.0.0
Mozilla Thunderbird<153.3.0
Mozilla Thunderbird>=154.0<156.0

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 156
  2. Upgrade

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

    Fixed in 153.3
  3. Upgrade

    Upgrade Mozilla Firefox to a version that resolves this vulnerability.

    Fixed in 156
  4. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 153.3
  5. Upgrade

    Upgrade Mozilla Thunderbird to a version that resolves this vulnerability.

    Fixed in 156
  6. Upgrade

    Upgrade Thunderbird 153.3 to a version that resolves this vulnerability.

    Fixed in 153.3

Event History

Sep 15, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
Affected Software
CVE Published
via MITRE·12:34 PM
Data Sourced
via MITRE·12:34 PM
Description
Data Sourced
via NVD·01:17 PM
DescriptionSeverityWeaknessAffected Software
Sep 16, 2026
Updated
via Mozilla·12:00 AM
Affected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

Which releases contain the fix?

The issue was fixed in Firefox 156 and Firefox ESR 153.3.

Company

Resources

Contact

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