CVE-2026-84133
Received Received - Intake

DOM Push Subscription Isolation Flaw in Firefox

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: Mozilla Corporation

Description
Site isolation issue in the DOM: Push Subscriptions component. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.

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Meta Information

Published
2026-09-01
Last Modified
2026-09-01
Generated
2026-09-01
AI Q&A
2026-09-01
EPSS Evaluated
N/A
NVD
CVE-2026-84133
EUVD
EUVD-2026-69081

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 155 (inc)
mozilla firefox_esr to 153.2 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a site isolation issue in the DOM Push Subscriptions component of Firefox. It was patched in Firefox 155 and Firefox ESR 153.2. The flaw could allow unauthorized access or manipulation of push subscription data between different sites.

Impact Analysis

An attacker might exploit this to intercept or alter push notifications, leading to data leaks or misinformation. Users could see unauthorized messages or have sensitive data exposed if they rely on push notifications for critical updates.

Compliance Impact

This could violate data protection requirements under GDPR or HIPAA if push subscription data includes personal or health information. Organizations must ensure patches are applied to avoid non-compliance penalties.

Mitigation Strategies

Update Firefox to version 155 or later and Firefox ESR to version 153.2 or later to address the DOM Push Subscriptions site isolation issue.

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