Command Injection in Microsoft M365 Copilot
CVE-2026-42824 is a command injection vulnerability in Microsoft M365 Copilot caused by improper neutralization of special elements used in a command. According to the provided Microsoft advisory context, the flaw affects the M365 Copilot service and can be exploited by an unauthorized attacker over a network. The authoritative advisory characterizes the resulting security impact as information disclosure. Some secondary reporting in the provided context describes it as remote code execution, but the Microsoft product advisory specifically identifies it as an information disclosure vulnerability stemming from command injection in the cloud service.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
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
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A command injection vulnerability in M365 Copilot that allows unauthorized network-based code execution.
A remote code execution vulnerability in Microsoft M365 Copilot caused by command injection.
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.