Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.
Date: 2026-01
Affected: microsoft/365_word_copilot
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-21521
CWE: CWE-150
CVSS: 7.4 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N)

Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.


Mitigations:

Architectural layers (MAESTRO):