PT-2026-38575 · Microsoft · M365 Copilot

0Xsombra + 2 · Published 2026-05-07 · Updated 2026-05-08 · CVE-2026-26164

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions M365 Copilot (affected versions not specified)

Description Improper neutralization of special elements in output used by a downstream component (injection) allows an unauthorized attacker to disclose information over a network.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Special Elements Injection

Weakness Enumeration

CWE-74

Related Identifiers

CVE-2026-26164

Affected Products

M365 Copilot

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-26164 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26164 · Vendor Advisory
• https://twitter.com/IntCyberDigest/status/2052864105153724723 · Twitter Post
• https://twitter.com/windowsforum/status/2052501956824838151 · Twitter Post