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CVE-2026-21521: Improper Neutralization of Escape, Meta, or Control Sequences

🗓️ 22 Jan 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com

Improper neutralization of control sequences in Copilot allows remote information disclosure.

Related
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-21521
22 Jan 202622:47
–attackerkb
circl
Circl
CVE-2026-21521
13 Feb 202604:55
–circl
cnnvd
CNNVD
Microsoft 365 Word Copilot security vulnerabilities
22 Jan 202600:00
–cnnvd
cve
CVE
CVE-2026-21521
22 Jan 202622:47
–cve
cvelist
Cvelist
CVE-2026-21521 Word Copilot Information Disclosure Vulnerability
22 Jan 202622:47
–cvelist
euvd
EUVD
EUVD-2026-4498
23 Jan 202600:31
–euvd
mscve
Microsoft CVE
Word Copilot Information Disclosure Vulnerability
22 Jan 202616:00
–mscve
nvd
NVD
CVE-2026-21521
22 Jan 202623:15
–nvd
ptsecurity
Positive Technologies
PT-2026-4308
22 Jan 202600:00
–ptsecurity
redhatcve
RedhatCVE
CVE-2026-21521
24 Jan 202603:17
–redhatcve
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30 Jul 2026 00:00Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.17.4
EPSS0.00599
SSVC
0