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Remote Code Execution in Microsoft Edge (Chromium-based)
CVE-2025-59251 is a remote code execution vulnerability affecting Microsoft Edge (Chromium-based), disclosed on September 24, 2025. Publicly available information does not identify the root cause, affected code path, vulnerable configurations, affected version range, or exploitation technique.
What it means and what to do now: patch path, interim mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Successful exploitation provides remote code execution through Microsoft Edge. Browser remote code execution vulnerabilities can enable compromise of an endpoint through malicious web content; the available information does not specify the execution context, privileges, or further confidentiality, integrity, or availability effects for this vulnerability.
If you can’t patch tonight, do this now.
If immediate patching is not possible, reduce exposure by limiting access to untrusted or high-risk web content, enforcing browser isolation or sandboxing controls where available, restricting execution of active content through enterprise browser policies, and monitoring for suspicious browser child-process activity or anomalous endpoint behavior originating from Edge. These are general mitigations for browser RCE exposure; no vulnerability-specific workaround is provided in the available public information.
Patch, then assume compromise.
Apply the Microsoft security update for Microsoft Edge associated with CVE-2025-59251 as provided through Microsoft's Edge security releases and the Microsoft Security Update Guide. Because the affected version range is not specified in the provided content, organizations should update Edge to the latest available patched release and verify deployment across enterprise-managed and consumer systems. Standard remediation should also include confirming successful browser restart and update application on all affected endpoints.
No public exploits tracked yet. Mallory keeps watching.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.