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CVE-2026-58289 is a critical remote code execution vulnerability in Microsoft Edge (Chromium-based) caused by access of a resource using an incompatible type (type confusion). The issue affects Microsoft Edge prior to the July 2026 security update, with Microsoft indicating that patched builds include Edge Stable version 150.0.4078.48 or later. Successful exploitation allows an unauthorized attacker to execute code over a network. The provided material does not identify the specific vulnerable function, component, or code path beyond the type confusion condition in Edge.
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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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical type confusion remote code execution vulnerability in Microsoft Edge that allows unauthorized network-based code execution.
A critical remote code execution vulnerability affecting Microsoft Edge (Chromium-based).
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.