CVE-2026-64728 in iOS
Summary
by MITRE • 07/28/2026
A permissions issue was addressed with improved validation. This issue is fixed in Safari 26.6, iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6. Maliciously crafted web content may violate iframe sandboxing policy.
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Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a critical permissions issue that affects Safari and related Apple operating systems, specifically addressing insufficient validation mechanisms that could allow malicious web content to bypass iframe sandboxing policies. The flaw exists within the browser's security model where proper input validation fails to adequately restrict privileged operations within sandboxed environments, creating potential attack vectors for adversaries seeking to escalate privileges or execute unauthorized actions through crafted web content.
The technical implementation of this vulnerability stems from inadequate sanitization and validation checks within Safari's iframe handling mechanisms. When processing maliciously crafted web content, the browser fails to properly enforce sandboxing restrictions that should prevent embedded content from accessing sensitive APIs or performing privileged operations. This weakness directly relates to common software security flaws categorized under CWE-284, which addresses improper access control issues, and CWE-119, concerning weak buffer access controls. The vulnerability allows attackers to craft web pages that can circumvent the intended isolation boundaries of iframe sandboxing policies.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to potentially execute arbitrary code within restricted browsing contexts or gain unauthorized access to user data and system resources. Attackers could leverage this flaw by hosting malicious web content that attempts to violate iframe sandboxing restrictions, potentially leading to cross-site scripting attacks, session hijacking, or other privilege-related compromises. The vulnerability affects multiple Apple platforms including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS, indicating a systemic issue within Apple's browser security implementation rather than isolated platform-specific problems.
Mitigation strategies should focus on immediate deployment of the patched versions mentioned in the advisory, specifically Safari 26.6 and corresponding operating system updates for all affected platforms. Organizations should implement network-level protections such as web application firewalls and content filtering solutions that can detect and block known malicious patterns in web content. Additionally, browser security configurations should be reviewed to ensure that iframe sandboxing policies are properly enforced, and users should be educated about the risks of visiting untrusted websites. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059 for command execution and T1211 for exploitation for privilege escalation, making it particularly concerning for enterprise security environments where browser-based attacks represent a significant threat vector.