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A WebKit vulnerability allows a malicious website to exfiltrate data across origins. The flaw stems from insufficient checks in WebKit's handling of cross-origin access, enabling web content from one origin to improperly obtain data associated with another origin. Apple states the issue was addressed with improved checks. The vulnerability affects Safari and Apple platforms that embed the vulnerable WebKit component, including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS in the affected release lines.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
Small 3-file proof-of-concept repository for CVE-2026-43735, a WebKit/Safari cross-origin information disclosure issue. The repository contains a README explaining the bug and two HTML pages: victim.html simulates a vulnerable parent page on origin A, and attacker.html simulates a malicious cross-origin iframe on origin B. The victim page embeds the attacker page in an iframe and includes a link with target="targetFrame" that navigates the iframe to a fragment URL (#updated). On vulnerable Safari/WebKit versions, attacker.html receives a Navigation API navigate event whose event.sourceElement incorrectly references the parent page's <a> element even though the iframe is cross-origin. The attacker script then dereferences sourceElement.ownerDocument to access the parent DOM and extract sensitive values (#profile-email and #account-panel data-account-id), logging them and returning them via postMessage. The victim page listens for ready/result messages, auto-clicks the link once the iframe is ready, and reports whether the browser is patched or vulnerable. This is a browser/web attack vector and a true exploit PoC rather than a mere detector, though it is not weaponized: it demonstrates data leakage and the README notes the same primitive could potentially support parent DOM modification, form action tampering, or script injection.
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11 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 WebKit vulnerability that may allow a malicious website to exfiltrate data cross-origin.
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.
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.