EIP-2026-118864

PRE-CVE

Microsoft Outlook Express 5/6 - Spoofable File Extensions

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-118864. PoCs published by Matthew Murphy.

AI-analyzed exploit summary This is a technical writeup describing a vulnerability in Outlook Express where MIME header manipulation allows spoofing file extensions, potentially tricking users into executing malicious files. The exploit leverages a specific string insertion between the filename and extension to mislead the user interface.

Description

Microsoft Outlook Express 5/6 - Spoofable File Extensions

Exploits (1)

exploitdb WRITEUP VERIFIED
by Matthew Murphy · textremotewindows
https://www.exploit-db.com/exploits/21631

This is a technical writeup describing a vulnerability in Outlook Express where MIME header manipulation allows spoofing file extensions, potentially tricking users into executing malicious files. The exploit leverages a specific string insertion between the filename and extension to mislead the user interface.

Classification
Writeup 90%
Attack Type
Other
Complexity
Trivial
Reliability
Reliable
Target: Outlook Express
No auth needed
Prerequisites: Access to a mail agent capable of manipulating MIME headers
devstral-2 · analyzed Feb 18, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026