CVE-2026-100760

Analyzed Analyzed - Analysis Complete

Firefox Sandbox Escape in Process Sandboxing

Publication date: 2026-09-29

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description

Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-09-29

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-09-29

EPSS Evaluated

2026-10-18

NVD

CVE-2026-100760

EUVD

EUVD-2026-88912

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 153.4.0 (exc)
mozilla	firefox	From 154.0.0 (inc) to 157.0.0 (exc)
mozilla	thunderbird	to 153.4.0 (exc)
mozilla	thunderbird	From 154.0 (inc) to 157.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-693	The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

Attack-Flow Graph

Executive Summary

This is a sandbox escape vulnerability in Firefox's Security: Process Sandboxing component. It allows malicious code to break out of the isolated sandbox environment, potentially gaining unauthorized access to the host system.

Detection Guidance

This CVE describes a sandbox escape in Firefox ESR 153.4 and Firefox 157. Detection involves checking installed Firefox versions and monitoring for unusual processes or behaviors. Use commands like 'firefox --version' to verify versions and 'ps aux | grep firefox' to inspect running processes. Ensure systems are updated to patched versions.

Impact Analysis

If exploited, this vulnerability could allow attackers to run arbitrary code on your system with the same privileges as the Firefox process. This could lead to data theft, installation of malware, or further network compromise.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Update Firefox ESR to version 153.4 or Firefox to version 157 or later to address the sandbox escape vulnerability in the Security: Process Sandboxing component.

Hi! I’m here to help you understand CVE-2026-100760. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70