CVE-2024-40867Network attack vector

Sandbox escape via malformed custom URL handling

Published Oct 28, 2024 · Updated Apr 2, 2026

Custom URL validation failure in iTunes on iOS and iPadOS before 18.1 allows remote attackers to escape the Web Content sandbox. The iTunes custom URL handler inadequately validates untrusted URLs before passing them across the Web Content sandbox boundary. Exploitation requires user interaction; Apple has not disclosed the malformed URL fields or the privileges available after escape.

CVSS severity9.6
Critical
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Custom URL validation failure in iTunes on iOS and iPadOS before 18.1 allows remote attackers to escape the Web Content sandbox. The iTunes custom URL handler inadequately validates untrusted URLs before passing them across the Web Content sandbox boundary. Exploitation requires user interaction; Apple has not disclosed the malformed URL fields or the privileges available after escape.

The record

CVE
CVE-2024-40867
Published
Oct 28, 2024
Updated
Apr 2, 2026
Vendor
Apple
Product
iOS
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 28, 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 <18.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOSversion=0 <18.1
Apple · iOS and iPadOSversion=0 <18.1
Apple · iPadOSversion=0 <18.1

Published CVSS scores

9.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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