CVE-2026-84139

Clickjacking issue in the DOM: Events component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

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CVSS v3.1

6.1 MEDIUM

EPSS

0.18%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

EPSS Trend

Sep 3, 2026 → Sep 5, 2026

▲ 0.04pp

0.14% → 0.18% over 2 tracked changes

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

ScopeCHANGED

ConfidentialityLOW

IntegrityLOW

AvailabilityNONE

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

Connections

3 relationships

CWE-1021

source

Timeline

disclosure → media coverage

Sep 1, 2026

Disclosure — published as a CVE record.