Cross-origin data exfiltration in WebKit
CVE-2026-43735 is a WebKit cross-origin security flaw affecting Safari 26.5.2 prior to the fix, iOS 26.5.2 prior to the fix, iPadOS 26.5.2 prior to the fix, and macOS Tahoe 26.5.2 prior to the fix. Apple states that a malicious website may exfiltrate data cross-origin and that the issue was addressed with improved checks. Based on the available information, the vulnerability is a failure in cross-origin enforcement or validation within WebKit that allows web content from one origin to improperly access or extract data associated with another origin.
Are you exposed to this one?
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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
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A WebKit cross-origin data exfiltration vulnerability that may allow a malicious website to steal data across origins.
A cross-origin data exfiltration vulnerability that could allow a malicious website to exfiltrate data.
A macOS Tahoe vulnerability that may allow a malicious website to exfiltrate data cross-origin.
A cross-origin data exfiltration vulnerability in Apple web content handling that could allow a malicious website to exfiltrate data.
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.