PT-2026-102534 · Mozilla · Firefox+2

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CVE-2026-100760

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Published

2026-09-29

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Updated

2026-09-29

CVSS v3.1

9.6

Critical

VectorAV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Name of the Vulnerable Software and Affected Versions Firefox ESR versions prior to 153.4 Thunderbird versions prior to 157 Firefox versions prior to 157
Description A sandbox escape exists within the Security: Process Sandboxing component. A sandbox is a security mechanism used to execute untrusted code in a restricted environment to prevent it from accessing the rest of the system.
Recommendations Update Firefox ESR to version 153.4. Update Thunderbird to version 157. Update Firefox to version 157.

Fix

Protection Mechanism Failure

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Weakness Enumeration

Related Identifiers

CVE-2026-100760

Affected Products

Firefox
Firefox Esr
Thunderbird