CVE-2026-26129 PUBLISHED

M365 Copilot Information Disclosure Vulnerability

Assigner: microsoft
Reserved: 11.02.2026 Published: 07.05.2026 Updated: 07.05.2026

Improper neutralization of special elements in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
CVSS Score: 7.5

Product Status

Vendor Microsoft
Product Microsoft 365 Copilot's Business Chat
Versions
  • Version - is affected

References

Problem Types