CVE-2026-92062

Received Received - Intake

Privilege Escalation in Firefox Session Restore

Publication date: 2026-09-15

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-09-15

Last Modified

2026-10-05

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92062

EUVD

EUVD-2026-78525

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	thunderbird	From 154.0 (inc) to 156.0 (exc)
mozilla	firefox	to 153.3.0 (exc)
mozilla	firefox	From 154.0.0 (inc) to 156.0.0 (exc)
mozilla	thunderbird	to 153.3.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-269	The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Attack-Flow Graph

Executive Summary

This is a privilege escalation vulnerability in Firefox's Session Restore component. It allows an attacker to gain higher privileges than intended, potentially taking control of the affected system.

Detection Guidance

Detection requires checking Firefox and Firefox ESR versions. If your system runs Firefox <156 or Firefox ESR <153.3, it is vulnerable. Use commands like 'firefox --version' or 'apt show firefox-esr' to check installed versions.

Impact Analysis

If exploited, this vulnerability could allow an attacker to escalate their privileges on your system, potentially accessing sensitive data or performing unauthorized actions. Users of affected Firefox versions should update immediately.

Compliance Impact

The provided CVE data does not specify how this vulnerability affects compliance with standards like GDPR or HIPAA. The vulnerability involves privilege escalation in Firefox's Session Restore component, but no direct impact on regulatory compliance is mentioned in the available resources.

Mitigation Strategies

Update Firefox to version 156 or later and Firefox ESR to version 153.3 or later to address the privilege escalation in the Session Restore component.

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