Vulnerability details

CVE-2026-16365

Privilege escalation in the DOM: Workers component

CVSS 3.1

8.8High

Official description

Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153, Thunderbird 153, Firefox ESR 140.15, and Thunderbird 140.15.

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: 2026-07-21
Last updated: 2026-09-02
State: Published
Assigner (CNA): mozilla

Exploit prediction (EPSS)

0.27%

Probability of exploitation in 30 days

20.2%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-269
Improper Privilege Management
CWE-284
Improper Access Control