CVE-2026-26129

7.5 HIGH

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to di...

Published: 2026-05-07 · Last updated: 2026-06-01

Severity and scoring

CVSS: 7.5 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE: CWE-138

Affected products

Vendor	Product
microsoft	365_copilot_chat

Description

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-26129
[Vendor advisory]https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129

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