CVE-2026-47644

7.5

HIGH CVSS 3.1

Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability

Overview

Description

Improper neutralization of special elements in output used by a downstream component ('injection') in Copilot Chat (Microsoft Edge) allows an unauthorized attacker to disclose information over a network.

Details

INFO

Published Date :

June 4, 2026, 11:17 p.m.

Last Modified :

June 8, 2026, 1:57 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]

Impact

Affected Products

The following products are affected by CVE-2026-47644 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Microsoft	copilot_chat_edge
2	Microsoft	copilot_chat

: Total Affected Vendor : 1 | Products : 2

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Version	Severity	Source
CVSS 3.1	MEDIUM	f38d906d-7342-40ea-92c1-6c4a2c6478c8
CVSS 3.1	MEDIUM	[email protected]
CVSS 3.1	HIGH	[email protected]

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-47644.

URL	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47644	Vendor Advisory

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-47644 is associated with the following CWEs:

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-47644 weaknesses.

CAPEC-3: Using Leading 'Ghost' Character Sequences to Bypass Input Filters Using Leading 'Ghost' Character Sequences to Bypass Input Filters CAPEC-6: Argument Injection Argument Injection CAPEC-7: Blind SQL Injection Blind SQL Injection CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-28: Fuzzing Fuzzing CAPEC-34: HTTP Response Splitting HTTP Response Splitting CAPEC-42: MIME Conversion MIME Conversion CAPEC-43: Exploiting Multiple Input Interpretation Layers Exploiting Multiple Input Interpretation Layers CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-51: Poison Web Service Registry Poison Web Service Registry CAPEC-52: Embedding NULL Bytes Embedding NULL Bytes CAPEC-53: Postfix, Null Terminate, and Backslash Postfix, Null Terminate, and Backslash CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic Using Slashes and URL Encoding Combined to Bypass Validation Logic CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog() CAPEC-71: Using Unicode Encoding to Bypass Validation Logic Using Unicode Encoding to Bypass Validation Logic CAPEC-72: URL Encoding URL Encoding CAPEC-76: Manipulating Web Input to File System Calls Manipulating Web Input to File System Calls CAPEC-78: Using Escaped Slashes in Alternate Encoding Using Escaped Slashes in Alternate Encoding CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic Using UTF-8 Encoding to Bypass Validation Logic CAPEC-83: XPath Injection XPath Injection CAPEC-84: XQuery Injection XQuery Injection CAPEC-101: Server Side Include (SSI) Injection Server Side Include (SSI) Injection CAPEC-105: HTTP Request Splitting HTTP Request Splitting CAPEC-108: Command Line Execution through SQL Injection Command Line Execution through SQL Injection CAPEC-120: Double Encoding Double Encoding CAPEC-135: Format String Injection Format String Injection CAPEC-250: XML Injection XML Injection CAPEC-267: Leverage Alternate Encoding Leverage Alternate Encoding CAPEC-273: HTTP Response Smuggling HTTP Response Smuggling

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-47644 vulnerability anywhere in the article.

CrowdStrike.com

June 2026 Patch Tuesday: Microsoft Patches 206 Vulnerabilities Including Three Publicly Disclosed Zero-Days

Microsoft has addressed 206 vulnerabilities in its June 2026 security update release. This month's patches include fixes for three publicly disclosed zero-day vulnerabilities and 37 Critical vulnerabi ...

Published Date: Jun 10, 2026 (2 weeks ago)

TheCyberThrone

Microsoft Patch Tuesday — June 2026

Microsoft’s June 2026 Patch Tuesday is the largest release since the Patch Tuesday program began, surpassing the previous record of 167 CVEs set in October 2025. This month’s release addresses 206 vul ...

Published Date: Jun 10, 2026 (2 weeks ago)

Zero Day Initiative

The June 2026 Security Update Review

CVE Title Severity CVSS Public Exploited XI Type CVE-2026-41091 Microsoft Defender Elevation of Privilege Vulnerability Important 7.8 Yes Yes 0 EoP CVE-2026-49160 HTTP.sys Denial of Service Vulnerabil ...

Published Date: Jun 09, 2026 (2 weeks, 1 day ago)

security.nl

Kritieke lekken in Exchange Online en Copilot maakten datadiefstal mogelijk

Microsoft heeft kritieke kwetsbaarheden in Exchange Online en Copilot gepatcht die het stelen van data mogelijk maakten. Ook is een M365 Copilot-lek verholpen dat tot remote code execution (RCE) kon l ...

Published Date: Jun 05, 2026 (2 weeks, 5 days ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-47644 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

Initial Analysis by [email protected]

Jun. 08, 2026

Action	Type	New Value
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Added	CPE Configuration	OR cpe:2.3:a:microsoft:copilot_chat:-:::::microsoft_edge::*
Added	Reference Type	Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47644 Types: Vendor Advisory

New CVE Received by [email protected]

Jun. 04, 2026

Action	Type	New Value
Added	Tag	exclusively-hosted-service
Added	Description	Improper neutralization of special elements in output used by a downstream component ('injection') in Copilot Chat (Microsoft Edge) allows an unauthorized attacker to disclose information over a network.
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Added	CWE	CWE-74
Added	Reference	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47644

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.