CVE-2026-109777: Information disclosure in the Storage: IndexedDB component

Published Oct 13, 2026
·
Updated

Information disclosure in the Storage: IndexedDB 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
Event
via NVD·03:42 PM

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 158 and Firefox ESR 153.5.

2

Does exploitation require an authenticated or privileged attacker?

No. The CVSS vector indicates network reachability, low attack complexity, and no privileges required, but user interaction is required.

3

What is the expected security impact?

The reported impact is limited to confidentiality: low-severity information disclosure, with no integrity or availability impact indicated by the CVSS vector.

Company

Resources

Contact

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