CVE-2026-12311 | Information disclosure, sandbox escape in the Security: Proc… | CVSS 4.7 MEDIUM

Description

Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

Metadata

CVE ID: CVE-2026-12311
State: PUBLISHED
Assigner: mozilla
Reserved: 2026-06-15 15:08 UTC
Published: 2026-06-16 11:52 UTC
Last updated: 2026-06-16 16:08 UTC
Primary CWE: CWE-688
CWE-688 Function Call With Incorrect Variable or Reference a…
Vendor / Product: Mozilla / Firefox
Sources: cve.org · NVD

Severity & Metrics

4.7 MEDIUM CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (2)

Vendor	Product	Platform	Versions
Mozilla	Firefox	—	140.12 ≤ 140., 152 ≤
Mozilla	Thunderbird	—	140.12 ≤ 140., 152 ≤

Weakness (CWE)

CWE	Source	Description
CWE-200	adp	CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-688	adp	CWE-688 Function Call With Incorrect Variable or Reference as Argument

CVSS scores (1)

Score	Severity	Version	Source	Vector
4.7	MEDIUM	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

References (5)