CVE-2026-92015

Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.

Scoring

Severity

HIGH

CVSS base score

8.8

CVSS vector

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

EPSS probability

0.27%

Published

2026-09-15

Last modified

2026-09-16

Affected products

• Mozilla Firefox
• Mozilla Firefox
• Mozilla Firefox
• Mozilla Firefox
• Mozilla Thunderbird
• Mozilla Thunderbird
• Mozilla Thunderbird

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