Description

Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-08-18T14:17:01.897Z",
  "pubdate": "2026-08-18T14:17:01.897Z",
  "executiveSummary": "This vulnerability involves an improper neutralization of special elements used in a command, commonly classified as command injection, residing within Microsoft Copilot.\nThe security flaw enables an unauthorized remote attacker to execute arbitrary commands and successfully disclose sensitive information over a network without requiring prior authentication or privileged access.\nThe primary impact of this vulnerability is the unauthorized exposure of confidential data, which poses severe risk implications regarding data confidentiality and system integrity.\nThe attack vector relies on network accessibility to the affected product, allowing malicious actors to leverage improperly sanitized input parameters to interact directly with the underlying operating system or application execution layer.\nSuccessful exploitation compromises the confidentiality boundaries of the deployed environment, potentially exposing internal assets and architecture to malicious entities.",
  "technicalDetails": "The root cause of the vulnerability stems from insufficient input validation and improper sanitization of special elements within Microsoft Copilot.\nWhen user-supplied data or external inputs are passed to underlying system commands or execution sinks without adequate neutralization, an attacker can append or inject malicious command sequences.\nThe vulnerable component handles command parsing and execution, failing to properly distinguish between intended static parameters and dynamically injected execution arguments.\nExploitation occurs over a network vector, requiring no prior authentication or specific user privileges, thereby lowering the attack complexity for unauthorized threat actors.\nDuring the attack flow, the malicious actor crafts a specialized payload containing command injection sequences designed to manipulate the execution flow of the target application.\nUpon ingestion of the malicious payload, the application passes the unsanitized input to the command interpreter or shell environment.\nThe underlying system executes the injected commands concurrently or sequentially with the primary application logic, granting the attacker the ability to interact with local system resources or query restricted data repositories.\nThe post-exploitation impact includes the unauthorized disclosure of sensitive information over the network, as the output or side effects of the injected commands are exfiltrated or leveraged to map internal network topology and configuration parameters."
}