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Description

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

PUBLISHED Reserved 2025-12-30 | Published 2026-01-22 | Updated 2026-01-22 | Assigner microsoft




HIGH: 7.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C

Problem types

CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences

Product status

-
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21521 (Word Copilot Information Disclosure Vulnerability) vendor-advisory patch

cve.org (CVE-2026-21521)

nvd.nist.gov (CVE-2026-21521)

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