CVE-2025-53787Network attack vector

Information disclosure via undisclosed command injection

Published Aug 7, 2025 · Updated Feb 26, 2026

Command injection in Microsoft 365 Copilot Business Chat allows remote attackers to disclose information over the network. Microsoft has not published the affected BizChat locus, the untrusted input involved, or how special command elements reach an interpreter. The network path requires no privileges or user interaction; the exposed data and any related integrity effect remain undisclosed.

CVSS severity8.2
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Microsoft 365 Copilot Business Chat allows remote attackers to disclose information over the network. Microsoft has not published the affected BizChat locus, the untrusted input involved, or how special command elements reach an interpreter. The network path requires no privileges or user interaction; the exposed data and any related integrity effect remain undisclosed.

The record

CVE
CVE-2025-53787
Published
Aug 7, 2025
Updated
Feb 26, 2026
Vendor
Microsoft
Product
Microsoft 365 Copilot Business Chat
Classifications
CWE-77, CAPEC-136, CAPEC-183, CAPEC-75, CAPEC-43, CAPEC-15, CAPEC-76, CAPEC-248, CAPEC-40
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=-

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft 365 Copilot Business Chatversion=-

Published CVSS scores

8.2Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CAPEC-136LDAP Injection
CAPEC-183IMAP/SMTP Command Injection
CAPEC-75Manipulating Writeable Configuration Files
CAPEC-43Exploiting Multiple Input Interpretation Layers
CAPEC-15Command Delimiters
CAPEC-76Manipulating Web Input to File System Calls
CAPEC-248Command Injection
CAPEC-40Manipulating Writeable Terminal Devices

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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