CVE-2026-2768 | Sandbox escape in the Storage: IndexedDB component. This vul… | CVSS 10.0 CRITICAL

Description

Sandbox escape in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Metadata

CVE ID: CVE-2026-2768
State: PUBLISHED
Assigner: mozilla
Reserved: 2026-02-19 15:05 UTC
Published: 2026-02-24 13:33 UTC
Last updated: 2026-07-15 01:13 UTC
Primary CWE: CWE-693
CWE-693 Protection Mechanism Failure
Vendor / Product: Mozilla / Firefox
Sources: cve.org · NVD

Severity & Metrics

10.0 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (2)

Vendor	Product	Platform	Versions
Mozilla	Firefox	—	140.8 ≤ 140., 148 ≤
Mozilla	Thunderbird	—	140.8 ≤ 140., 148 ≤

Weakness (CWE)

CWE	Source	Description
CWE-284	adp	CWE-284 Improper Access Control
CWE-693	adp	CWE-693 Protection Mechanism Failure

CVSS scores (2)

Score	Severity	Version	Source	Vector
10.0	CRITICAL	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
7.5	HIGH	3.1	adp	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References (5)