CVE-2026-16391 | Information disclosure in the Storage: IndexedDB component. … | CVSS 7.5 HIGH

Description

Information disclosure in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Metadata

CVE ID: CVE-2026-16391
State: PUBLISHED
Assigner: mozilla
Reserved: 2026-07-20 21:57 UTC
Published: 2026-07-21 12:38 UTC
Last updated: 2026-07-22 19:18 UTC
Primary CWE: CWE-200
CWE-200 Exposure of Sensitive Information to an Unauthorized…
Vendor / Product: Mozilla / Firefox
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: partial

Affected products (2)

Vendor	Product	Platform	Versions
Mozilla	Firefox	—	140.13 ≤ 140., 153 ≤
Mozilla	Thunderbird	—	140.13 ≤ 140., 153 ≤

Weakness (CWE)

CWE	Source	Description
CWE-200	adp	CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

CVSS scores (1)

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

References (5)