WebKit iframe download settings confusion in Safari
CVE-2026-28971 is a WebKit user-interface handling vulnerability affecting Safari 26.5, iOS 26.5, iPadOS 26.5, macOS Tahoe 26.5, visionOS 26.5, and Safari 26.5 on macOS Sonoma and macOS Sequoia. Apple describes the issue as a case where a malicious iframe may use another website’s download settings. The flaw was addressed with improved UI handling. Based on the available advisory text, the vulnerability involves incorrect association or presentation of download-related security/UI state across origins within embedded web content, allowing an iframe controlled by an attacker to inherit or leverage download settings belonging to a different website.
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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
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Remediation
Patch, then assume compromise.
Exploits
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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
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A memory handling issue in Apple web content processing that may cause an unexpected process crash via maliciously crafted web content.
A memory handling issue in Apple software for macOS Sonoma and macOS Sequoia where maliciously crafted web content may cause an unexpected process crash.
A WebKit security policy issue where a malicious iframe may use another website's download settings.
A web content handling vulnerability in macOS Tahoe that may lead to an unexpected process crash.
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.