CVE-2026-64728Network attack vector

Iframe sandbox-policy bypass via permission validation failure

Published Jul 27, 2026 · Updated Jul 27, 2026

WebKit permission validation in Apple OS releases and Safari before 26.6 allows remote attackers to violate iframe sandbox policy. WebKit fails to validate permissions correctly when processing attacker-controlled iframe content; Apple has not disclosed the affected function or exact validation error. A user must process the crafted content; the affected products are Safari, iOS, iPadOS, macOS Tahoe, tvOS, visionOS, and watchOS, and the reported consequence is policy bypass rather than host-process code execution.

CVSS severity6.5
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

WebKit permission validation in Apple OS releases and Safari before 26.6 allows remote attackers to violate iframe sandbox policy. WebKit fails to validate permissions correctly when processing attacker-controlled iframe content; Apple has not disclosed the affected function or exact validation error. A user must process the crafted content; the affected products are Safari, iOS, iPadOS, macOS Tahoe, tvOS, visionOS, and watchOS, and the reported consequence is policy bypass rather than host-process code execution.

The record

CVE
CVE-2026-64728
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-693
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 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 <26.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=0 <26.6
Apple · visionOSversion=0 <26.6
Apple · Safariversion=0 <26.6
Apple · tvOSversion=0 <26.6
Apple · macOSversion=0 <26.6
Apple · watchOSversion=0 <26.6

Published CVSS scores

6.5CISA-ADPCVSS: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

CWE-693Protection Mechanism Failure

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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