AI / ML CVE-2026-21521
HIGHSeverity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Lifecycle Timeline
2DescriptionCVE.org
Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Information disclosure in Microsoft 365 Word Copilot enables unauthenticated attackers to extract sensitive data through improper handling of escape and control sequences in network communications. The vulnerability requires user interaction to trigger and affects the Copilot AI/ML service with a CVSS score of 7.4. No patch is currently available.
Technical ContextAI
Affects 365 Word Copilot. Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
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Same technique Information Disclosure
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External POC / Exploit Code
Leaving vuln.today