Vulnerability details

CVE-2026-8970

Privilege escalation in the Security component

CVSS 3.1

8.8High

Official description

Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVSS scores

Score	Version	Source	Vector
8.8High	3.1	CISA ADP / Vulnrichment (CISA-ADP)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
No product information recorded.

References and advisories

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Details

Published: 2026-05-19
Last updated: 2026-05-20
State: Published
Assigner (CNA): mozilla

Exploit prediction (EPSS)

0.3%

Probability of exploitation in 30 days

23.5%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-269
Improper Privilege Management