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CVE-2026-21521
HIGH7.4
Description
Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.
CVE Details
CVSS v3.1 Score7.4
SeverityHIGH
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Attack VectorNETWORK
ComplexityLOW
Privileges RequiredNONE
User InteractionREQUIRED
Published1/22/2026
Last Modified2/2/2026
Sourcenvd
Honeypot Sightings0
Affected Products
microsoft:365_word_copilot
Weaknesses (CWE)
CWE-150
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21521(secure@microsoft.com)
IOC Correlations
No correlations recorded
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