CVE-2026-100782

Analyzed Analyzed - Analysis Complete

Privilege Escalation in Firefox Due to Boundary Condition Error

Publication date: 2026-09-29

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-09-29

Last Modified

2026-10-05

Generated

2026-10-19

AI Q&A

2026-09-29

EPSS Evaluated

2026-10-18

NVD

CVE-2026-100782

EUVD

EUVD-2026-88934

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	From 154.0.0 (inc) to 157.0.0 (exc)
mozilla	thunderbird	From 154.0 (inc) to 157.0 (exc)
mozilla	firefox	to 115.42.0 (exc)
mozilla	firefox	From 116.0 (inc) to 140.17.0 (exc)
mozilla	firefox	From 141.0 (inc) to 153.4.0 (exc)
mozilla	thunderbird	to 140.17.0 (exc)
mozilla	thunderbird	From 141.0 (inc) to 153.4.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-119	The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

Executive Summary

This is a privilege escalation vulnerability caused by incorrect boundary conditions in the Graphics component of Firefox. It allows attackers to gain elevated privileges through improper handling of certain inputs.

Detection Guidance

This vulnerability is specific to Firefox browsers and requires checking the installed version against the patched releases. Use commands like 'firefox --version' to check your Firefox version. If your version is below Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, or Firefox ESR 140.17, the system is vulnerable.

Impact Analysis

An attacker could exploit this to gain unauthorized access to sensitive data or execute arbitrary code on your system. This could lead to data theft, system compromise, or further network intrusions if combined with other vulnerabilities.

Compliance Impact

The vulnerability allows privilege escalation through incorrect boundary conditions in the Graphics component, which could lead to unauthorized access or control. This may impact compliance with GDPR by potentially exposing personal data or violating data integrity, and with HIPAA by risking unauthorized access to protected health information if exploited.

Mitigation Strategies

Update Firefox to a patched version: Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, or Firefox ESR 140.17 or later. This vulnerability was fixed in these releases.

Hi! I’m here to help you understand CVE-2026-100782. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70