CVE-2026-8955
Privilege Escalation in Firefox DOM Workers
Publication date: 2026-05-19
Last updated on: 2026-05-20
Assigner: Mozilla Corporation
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mozilla | firefox | to 151.0.0 (exc) |
| mozilla | firefox | to 140.11.0 (exc) |
| mozilla | thunderbird | to 151.0.0 (exc) |
| mozilla | thunderbird | to 140.11 (exc) |
Helpful Resources
Exploitability
| 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
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a privilege escalation issue in the DOM: Workers component of Mozilla Firefox. It allows an attacker to gain higher privileges than intended within the browser environment. The issue was addressed and fixed in Firefox version 151 and Firefox ESR 140.11.
How can this vulnerability impact me? :
The vulnerability could allow an attacker to escalate their privileges within the browser, potentially enabling them to execute actions or access data that should be restricted. This could lead to unauthorized access or manipulation of browser processes or user data.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this privilege escalation vulnerability in the DOM: Workers component, you should update your Firefox browsers to version 151 or later, and Firefox ESR to version 140.11 or later.