CVE-2026-84128 | BDVDB-2026-367103 Detail

MozillaFirefox

Description#

Privilege escalation in the WebDriver BiDi component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

No public exploit known

8.8 High

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 38.2.

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Improper Access Control

No specific action is recorded in the source data. Check the references for vendor guidance.

Not available

8.8 High

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

Not available

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).