CVE-2026-84128

Description

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

Affected Platforms

Weakness Type

CWE-284

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2044280
• https://www.mozilla.org/security/advisories/mfsa2026-82/
• https://www.mozilla.org/security/advisories/mfsa2026-86/