Description
Improper neutralization of special elements in output used by a downstream component ('injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Published: 2026-05-07
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Fri, 08 May 2026 20:00:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft 365 Copilot Chat
CPEs cpe:2.3:a:microsoft:365_copilot_chat:-:*:*:*:*:*:*:*
Vendors & Products Microsoft 365 Copilot Chat

Fri, 08 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 07 May 2026 21:30:00 +0000

Type Values Removed Values Added
Description Improper neutralization of special elements in output used by a downstream component ('injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Title M365 Copilot Information Disclosure Vulnerability
First Time appeared Microsoft
Microsoft 365 Copilot Business Chat
Weaknesses CWE-74
CPEs cpe:2.3:a:microsoft:365_copilot_business_chat:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft 365 Copilot Business Chat
References
Metrics cvssV3_1

{'score': 7.5, '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'}


Subscriptions

Microsoft 365 Copilot Business Chat 365 Copilot Chat
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-05-15T17:13:38.118Z

Reserved: 2026-02-11T18:33:57.776Z

Link: CVE-2026-26164

cve-icon Vulnrichment

Updated: 2026-05-08T13:51:57.730Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-07T22:16:33.773

Modified: 2026-05-08T19:53:26.070

Link: CVE-2026-26164

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-08T00:00:11Z

Weaknesses