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

Project Subscriptions

Vendors Products
Microsoft Subscribe
365 Copilot Business Chat Subscribe
365 Copilot Chat Subscribe
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 08 May 2026 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


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

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

Type Values Removed Values Added
Description Improper neutralization of special elements 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-138
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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-05-08T21:29:40.688Z

Reserved: 2026-02-11T15:52:13.912Z

Link: CVE-2026-26129

cve-icon Vulnrichment

Updated: 2026-05-08T15:47:21.858Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-07T22:16:33.607

Modified: 2026-05-08T19:53:02.500

Link: CVE-2026-26129

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-07T23:00:07Z

Weaknesses