CVE-2026-8957
Privilege Escalation in Firefox Enterprise Policies
Publication date: 2026-05-19
Last updated on: 2026-05-20
Assigner: Mozilla Corporation
Description
Description
CVSS Scores
EPSS Scores
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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 140.11 (exc) |
| mozilla | thunderbird | to 151.0.0 (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 Enterprise Policies component of Mozilla Firefox. It allows an attacker to gain higher privileges than intended within the affected software.
The issue was addressed and fixed in Firefox version 151 and Firefox ESR 140.11.
How can this vulnerability impact me? :
Exploitation of this vulnerability could allow an attacker to escalate their privileges within the Firefox browser environment, potentially leading to unauthorized actions or access to restricted features.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this privilege escalation vulnerability in the Enterprise Policies component, update Firefox to version 151 or later, or Firefox ESR to version 140.11 or later.