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High severity7.4NVD Advisory· Published Jan 22, 2026· Updated Jun 17, 2026

CVE-2026-21521

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

3

Microsoft/Copilotllm-fuzzy
Microsoft/365 Copilot BizChatcpe-rescue
Range: -
Microsoft/365 Word Copilot
cpe:2.3:a:microsoft:365_word_copilot:-:*:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

1

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21521nvdVendor Advisory

News mentions

0

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