Description

A permissions issue was addressed by removing the vulnerable code. This issue is fixed in Safari 27, iOS 27 and iPadOS 27, macOS Golden Gate 27, tvOS 27, visionOS 27, watchOS 27. Processing maliciously crafted web content may disclose sensitive user information.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-09-14T21:17:14.880Z",
  "pubdate": "2026-09-14T21:17:14.880Z",
  "executiveSummary": "A permissions vulnerability exists within the WebKit-based rendering engine used across multiple Apple ecosystem products, including Safari 27, iOS 27, iPadOS 27, macOS Golden Gate 27, tvOS 27, visionOS 27, and watchOS 27.\nThe vulnerability allows an attacker to bypass established security boundaries when processing maliciously crafted web content.\nSuccessful exploitation results in the unauthorized disclosure of sensitive user information, potentially leading to a compromise of privacy or data confidentiality.\nThe vulnerability manifests during the parsing and rendering of untrusted web resources, requiring no specific user interaction beyond navigating to the malicious content.\nThe risk implication is high, as the flaw resides in core web processing components, making it accessible to any attacker capable of hosting web content.\nMitigation requires updating affected devices to the versions specified in the security advisory to ensure the removal of the vulnerable code path.",
  "technicalDetails": "The vulnerability originates from a flaw in the permissions management architecture within the web content processing pipeline of the affected platforms. The root cause is identified as an improper validation of access control checks when handling specific, maliciously crafted web structures.\nIn a standard browser environment, strict sandbox policies and the Same-Origin Policy (SOP) are designed to isolate web content and prevent unauthorized cross-origin data access. The vulnerability indicates that the affected versions failed to enforce these access control protocols correctly during the rendering process.\nThe attack flow begins when a user is induced to navigate to a webpage containing the maliciously crafted content. Upon processing this content, the rendering engine erroneously grants the malicious script or resource access to privileged data or memory regions that should have been restricted.\nBecause the issue involves the improper handling of web content, the execution occurs within the context of the browser's rendering process. An attacker can leverage this to bypass the expected permissions model, effectively exfiltrating sensitive data stored in local storage, cookies, or potentially memory residing in the renderer's address space.\nThe vulnerability does not require authentication or elevated privileges, as it exploits the browser's inherent trust in the web content it is tasked to render. The attack is network-exposed, meaning any public web resource can be weaponized to trigger the flaw upon rendering.\nUpon successful exploitation, the payload can perform unauthorized read operations on protected data structures, facilitating the disclosure of sensitive user information. This represents a significant breakdown in the browser's defensive posture, as the integrity of the information isolation boundary is compromised.\nThe remediation involved the removal of the vulnerable code segment, which effectively closes the unintended path that allowed for the unauthorized permission escalation. This repair ensures that subsequent web content processing adheres to standard security constraints, preventing the disclosure of information to unauthorized actors."
}