CVE-2024-40866Network attack vector

Address-bar spoofing from malicious websites

Published Sep 16, 2024 · Updated Apr 2, 2026

Address-bar spoofing in Apple Safari before 18 and macOS before 15 allows remote attackers to misrepresent a site's origin. Apple has not published which WebKit UI state or rendering operation lets untrusted web content display a misleading address. A victim must visit a malicious website, after which the false origin can support phishing without reported code execution or data access.

CVSS severity6.5
Medium
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Address-bar spoofing in Apple Safari before 18 and macOS before 15 allows remote attackers to misrepresent a site's origin. Apple has not published which WebKit UI state or rendering operation lets untrusted web content display a misleading address. A victim must visit a malicious website, after which the false origin can support phishing without reported code execution or data access.

The record

CVE
CVE-2024-40866
Published
Sep 16, 2024
Updated
Apr 2, 2026
Vendor
Apple
Product
Safari
Classifications
T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · Safariversion=0 <18
Apple · macOSversion=0 <15

Published CVSS scores

6.5CanonicalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

T1189Drive-by Compromise

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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