CVE-2026-26129

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

Score

CVSS 3.1 7.5 High

Status

Modified - secure@microsoft.com

Published

2026-05-07

Last modified

2026-10-26

Weaknesses

CWE-138

Affected products

• 365 Copilot Business Chat (Microsoft)
• 365 Copilot Chat (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129