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CVE-2026-48561 is a critical remote code execution vulnerability in Microsoft Copilot caused by improper neutralization of special elements used in a command. The flaw is classified as CWE-77 and arises from insufficient sanitization of attacker-controlled input before it is incorporated into command processing. Microsoft states that an unauthorized attacker can exploit the issue over a network. Reported attack scenarios indicate that crafted prompts can be delivered to Copilot through integrated browser-driven workflows, causing the affected component to process malicious input without adequate confirmation or origin validation. Successful exploitation can result in arbitrary code execution and may cross a security boundary in some deployment scenarios, including traversal from a low-privilege Hyper-V guest context to code execution in the Hyper-V host execution environment.
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No public exploit code observed for this vulnerability.
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14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical remote code execution vulnerability in Microsoft Copilot.
A critical remote code execution vulnerability in Microsoft Copilot that can be triggered over the network via a malicious website causing Edge for Android to send crafted prompts to Copilot.
A critical remote code execution vulnerability in Microsoft Copilot that can be triggered over the network via a malicious website causing Microsoft Edge for Android to send crafted prompts to Copilot.
A remote code execution vulnerability in Copilot caused by improper neutralization of input, allowing unauthorized code execution from low-privileged Hyper-V guest access.
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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.