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CVE-2026-20665 is a WebKit state-management vulnerability in Apple platforms and WebKit-based downstream projects that allows maliciously crafted web content to prevent Content Security Policy from being enforced. The flaw affects WebKit as shipped in Safari and multiple Apple operating systems, as well as WebKitGTK and WPE WebKit before 2.52.1. The issue was remediated through improved state management. By interfering with CSP enforcement during web content processing, an attacker-controlled page can weaken or bypass browser-imposed policy restrictions that are intended to limit script execution and other resource-loading behaviors.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
15 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.
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.