Apple has released Safari 11.1 for OS X 10.11.6 El Capitan and macOS 10.12.6 Sierra (High Sierra 10.13.4 also includes it; see “macOS 10.13.4 High Sierra Adds Business Chat and External GPU Support,” 30 March 2018). The update addresses an inconsistent user interface issue that could lead to address bar spoofing, improves autofill heuristics to ensure a malicious Web site cannot exfiltrate auto-filled data in Safari without explicit user interaction, and resolves multiple memory corruption issues that could lead to arbitrary code execution when processing a maliciously crafted Web page. Safari 11.1 is available only via Software Update. (Free, release notes, 10.11.6+)
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