CVE-2026-21521

high

Description

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

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21521

Details

Source: Mitre, NVD

Published: 2026-01-22

Updated: 2026-01-26

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

Severity: High

CVSS v3

Base Score: 7.4

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Severity: High

EPSS

EPSS: 0.0007