CVE-2026-43821 in Safari
Summary
by MITRE • 07/28/2026
An access issue was addressed with improved access restrictions. 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. An app may be able to read files outside of its sandbox.
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Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a critical sandbox escape flaw that undermines the fundamental security model of Apple's operating systems. The issue stems from insufficient access controls that allow malicious applications to bypass sandbox restrictions and gain unauthorized access to files outside their designated execution environment. Such a weakness directly violates the principle of least privilege and could enable attackers to exfiltrate sensitive data or manipulate system resources beyond what is intended for individual applications.
The technical implementation flaw likely involves improper validation of file system access requests or inadequate boundary checking within the operating system's security framework. This allows an application to traverse directory structures and access files that should be restricted based on the app's sandbox permissions. The vulnerability affects multiple platforms including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS, indicating a systemic issue within Apple's core security architecture rather than a platform-specific implementation error.
From an operational perspective, this vulnerability creates significant risk for users who may unknowingly install malicious applications that can then access personal files, documents, photos, or other sensitive data stored on their devices. The impact extends beyond individual privacy concerns to potential corporate data breaches when users employ personal devices for work-related activities. Attackers could leverage this flaw to establish persistent access to target systems, potentially enabling advanced persistent threat campaigns.
The remediation implemented in Safari 26.6 and corresponding operating system versions addresses the underlying access control mechanisms by strengthening sandbox boundary enforcement and improving file system permission validation. This fix aligns with security best practices outlined in the CWE taxonomy under weakness category 250, which covers "Privilege Issues" and specifically addresses improper privilege management scenarios. The mitigation approach likely involves enhanced kernel-level access control checks and stricter validation of inter-process communication requests.
Organizations should prioritize deployment of these security updates across all affected platforms to prevent exploitation attempts. Security teams should monitor for any reported exploitation attempts or related vulnerabilities that may emerge from similar sandbox escape techniques. The fix demonstrates Apple's commitment to maintaining robust security boundaries as recommended by the mitre ATT&CK framework's privilege escalation tactics, where maintaining access through proper sandboxing is crucial for preventing broader system compromise and data exfiltration operations.