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CVE-2026-24299 is an information disclosure vulnerability in M365 Copilot caused by improper neutralization of special elements used in a command. The flaw is classified as command injection and allows attacker-controlled input to influence command-related processing within the service in a way that can expose sensitive information to an unauthorized remote attacker. Available reporting indicates the issue was exploitable over the network, required no prior authentication, and depended on user interaction. The vulnerability affected the cloud service rather than a customer-managed software version, and Microsoft remediated it server-side.
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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 separate command injection vulnerability in Microsoft 365 Copilot mentioned for comparison and product security history.
A Microsoft-assigned CVE covering a chain of vulnerabilities in Microsoft 365 Copilot and related Copilot experiences that enabled indirect prompt-injection-driven data exfiltration via HTML preview/CSS font loading, memory manipulation, and persistent backdoor-like behavior.
An information disclosure vulnerability in M365 Copilot caused by improper neutralization of special elements used in a command (command injection), allowing an unauthorized attacker to disclose information over a network.
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.