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CVE Vulnerability Details :
CVE-2026-26129
PUBLISHED
More InfoOfficial Page
Assigner-microsoft
Assigner Org ID-f38d906d-7342-40ea-92c1-6c4a2c6478c8
View Known Exploited Vulnerability (KEV) details
Published At-07 May, 2026 | 20:58
Updated At-08 May, 2026 | 21:29
Rejected At-
▼CVE Numbering Authority (CNA)
M365 Copilot Information Disclosure Vulnerability

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

Affected Products
Vendor
Microsoft CorporationMicrosoft
Product
Microsoft 365 Copilot's Business Chat
Versions
Affected
  • -
Problem Types
TypeCWE IDDescription
CWECWE-138CWE-138: Improper Neutralization of Special Elements
Type: CWE
CWE ID: CWE-138
Description: CWE-138: Improper Neutralization of Special Elements
Metrics
VersionBase scoreBase severityVector
3.17.5HIGH
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
Version: 3.1
Base score: 7.5
Base severity: HIGH
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129
vendor-advisory
patch
Hyperlink: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129
Resource:
vendor-advisory
patch
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found