WebKit Content Security Policy enforcement bypass via malicious web content
CVE-2026-20665 is a WebKit state-management flaw in which processing maliciously crafted web content may prevent Content Security Policy (CSP) from being enforced. Apple states the issue was addressed through improved state management. The vulnerability affects WebKit across multiple Apple platforms, including Safari 26.4, iOS 18.7.7, iPadOS 18.7.7, iOS 26.4, iPadOS 26.4, macOS Tahoe 26.4, tvOS 26.4, visionOS 26.4, and watchOS 26.4, and also affects WebKitGTK and WPE WebKit before 2.52.1. The available advisory text does not identify the exact vulnerable function, but the issue is explicitly described as allowing malicious web content to interfere with CSP enforcement.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A WebKit browser-engine vulnerability involved in malicious web content handling as part of a set of browser security flaws.
A web content processing issue that may prevent Content Security Policy enforcement.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.