Unrated severityNVD Advisory· Published Jan 22, 2026· Updated Apr 1, 2026
Word Copilot Information Disclosure Vulnerability
CVE-2026-21521
Description
Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.
Affected products
1- Microsoft/Microsoft 365 Word Copilotv5Range: -
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
1- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21521mitrevendor-advisorypatch
News mentions
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