CVE-2026-74952: Privilege escalation in the Application Update component

Published Aug 18, 2026
·
Updated

Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 153.2, and Thunderbird 153.2.

Affected Software

7 affected componentsFixes available
Mozilla Firefox<154
Mozilla Firefox<154
154
Mozilla Thunderbird<154
154
Mozilla Firefox ESR<153.2
153.2
Mozilla Firefox<154.0.0
Mozilla Thunderbird<154.0
Mozilla Thunderbird<153.2
153.2

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 154
  2. Upgrade

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

    Fixed in 153.2
  3. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 154
  4. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 154
  5. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 153.2
  6. Upgrade

    Upgrade Thunderbird ESR to a version that resolves this vulnerability.

    Fixed in 153.2

Event History

Aug 18, 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·12:23 PM
Data Sourced
via MITRE·12:23 PM
Description
Data Sourced
via NVD·01:17 PM
DescriptionSeverityWeaknessAffected Software
Sep 1, 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 Firefox version includes the fix?

Firefox 154 contains the fix. Systems running an earlier Firefox version may remain affected until they are updated.

Company

Resources

Contact

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