PT-2026-38575 · Microsoft · M365 Copilot

0Xsombra + 2 · Published 2026-05-07 · Updated 2026-06-01 · CVE-2026-26164

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:C/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

BDU:2026-06468

CVE-2026-26164

Affected Products

M365 Copilot

References · 13

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26164 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-26164 · Security Note
• https://bdu.fstec.ru/vul/2026-06468 · Security Note
• https://twitter.com/windowsforum/status/2052501956824838151 · Twitter Post
• https://feedly.com/cve/CVE-2026-26164 · Note
• https://twitter.com/infoflowcloud/status/2053560100921475351 · Twitter Post
• https://reddit.com/r/KibernetinisSaugumas/comments/1tasmgh/kibernetinio_saugumo_radar_2060512 · Reddit Post
• https://twitter.com/IntCyberDigest/status/2052864105153724723 · Twitter Post
• https://t.me/cveNotify/165516 · Telegram Post
• https://twitter.com/PurpleOps_io/status/2056795858562154903 · Twitter Post
• https://github.com/advisories/GHSA-qvcj-rgrx-wm72 · Note
• https://t.me/cveNotify/162643 · Telegram Post
• https://twitter.com/CVEnew/status/2053559206255493617 · Twitter Post