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NVD Vulnerability Details :
CVE-2026-26129
Analyzed
More InfoOfficial Page
Source-secure@microsoft.com
View Known Exploited Vulnerability (KEV) details
Published At-07 May, 2026 | 22:16
Updated At-08 May, 2026 | 19:53

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

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Type: Primary
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
CPE Matches
Microsoft Corporation
microsoft
>>365_copilot_chat>>-
cpe:2.3:a:microsoft:365_copilot_chat:-:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-138Primarysecure@microsoft.com
CWE ID: CWE-138
Type: Primary
Source: secure@microsoft.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129secure@microsoft.com
Vendor Advisory
Hyperlink: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129
Source: secure@microsoft.com
Resource:
Vendor Advisory
Change History
0Changes found
Details not found