CVE-2026-74978

Misdirected user actions via undisclosed Widget flaw

Published Aug 18, 2026 · Updated Aug 18, 2026

Clickjacking in Mozilla Firefox and Thunderbird before 154 and Firefox ESR and Thunderbird ESR before 153.1 allows attackers to misdirect clicks. Mozilla identifies the affected locus only as the shared Widget component and has not published the incorrect rendering or event-handling operation. Exploitation requires interaction with deceptive interface content, but Mozilla has not disclosed which action can be triggered or its security consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Clickjacking in Mozilla Firefox and Thunderbird before 154 and Firefox ESR and Thunderbird ESR before 153.1 allows attackers to misdirect clicks. Mozilla identifies the affected locus only as the shared Widget component and has not published the incorrect rendering or event-handling operation. Exploitation requires interaction with deceptive interface content, but Mozilla has not disclosed which action can be triggered or its security consequence.

The record

CVE
CVE-2026-74978
Published
Aug 18, 2026
Updated
Aug 18, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1204
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204User Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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