Mozilla Firefox up to 153.1/154 Push Subscriptions isolation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.0$5k-$25k0.00+

Summaryinfo

A vulnerability labeled as critical has been found in Mozilla Firefox up to 153.1/154. This issue affects some unknown processing of the component Push Subscriptions. Such manipulation leads to isolation. This vulnerability is referenced as CVE-2026-84133. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 153.1/154. It has been rated as critical. Affected by this issue is an unknown part of the component Push Subscriptions. The manipulation with an unknown input leads to a isolation vulnerability. Using CWE to declare the problem leads to CWE-653. The product does not properly compartmentalize or isolate functionality, processes, or resources that require different privilege levels, rights, or permissions. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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

The advisory is available at bugzilla.mozilla.org. This vulnerability is handled as CVE-2026-84133 since 09/01/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/01/2026).

Upgrading to version 153.2 or 155 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Isolation
CWE: CWE-653
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Firefox 153.2/155

Timelineinfo

09/01/2026 Advisory disclosed
09/01/2026 +0 days CVE reserved
09/01/2026 +0 days VulDB entry created
09/01/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2026-84133 (🔒)
GCVE (CVE): GCVE-0-2026-84133
GCVE (VulDB): GCVE-100-397610

Entryinfo

Created: 09/01/2026 15:00
Changes: 09/01/2026 15:00 (57)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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