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Description

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

PUBLISHED Reserved 2026-02-11 | Published 2026-05-07 | Updated 2026-05-08 | Assigner microsoft




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

Problem types

CWE-138: Improper Neutralization of Special Elements

Product status

-
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129 (M365 Copilot Information Disclosure Vulnerability) vendor-advisory patch

cve.org (CVE-2026-26129)

nvd.nist.gov (CVE-2026-26129)

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