CVE-2026-20665
Received Received - Intake
Content Security Policy Bypass in Safari and Apple OS Web Engines

Publication date: 2026-03-25

Last updated on: 2026-03-25

Assigner: Apple Inc.

Description
This issue was addressed through improved state management. This issue is fixed in Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, tvOS 26.4, visionOS 26.4, watchOS 26.4. Processing maliciously crafted web content may prevent Content Security Policy from being enforced.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-03-25
Last Modified
2026-03-25
Generated
2026-06-16
AI Q&A
2026-03-25
EPSS Evaluated
2026-06-14
NVD
CVE-2026-20665
EUVD
EUVD-2026-15051
Affected Vendors & Products
Showing 9 associated CPEs
Vendor Product Version / Range
apple ipados to 18.7.7 (exc)
apple ipados From 26.0 (inc) to 26.4 (exc)
apple iphone_os to 18.7.7 (exc)
apple iphone_os From 26.0 (inc) to 26.4 (exc)
apple tvos to 26.4 (exc)
apple visionos to 26.4 (exc)
apple watchos to 26.4 (exc)
apple macos to 26.4 (exc)
apple safari to 26.4 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-693 The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability involves a flaw in state management that affects how certain Apple operating systems and Safari process web content. Specifically, when maliciously crafted web content is processed, it may prevent the enforcement of the Content Security Policy (CSP). CSP is a security feature designed to restrict resources that web pages can load, helping to prevent attacks such as cross-site scripting (XSS).

Impact Analysis

If exploited, this vulnerability could allow attackers to bypass Content Security Policy protections, potentially enabling them to execute malicious scripts or load unauthorized resources in affected Apple devices and browsers. This could lead to security risks such as data theft, session hijacking, or other malicious activities when browsing the web.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, update affected Apple products to the fixed versions: Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, tvOS 26.4, visionOS 26.4, and watchOS 26.4.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-20665. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart