EIP-2026-118861

PRE-CVE

Microsoft Outlook Express 4.x/5.x/6.0 - Attachment Processing File Extension Obfuscation

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-118861. PoCs published by Benjamin Tobias Franz.

AI-analyzed exploit summary This exploit leverages a file extension obfuscation vulnerability in Microsoft Outlook Express to bypass attachment security warnings. By crafting an EML attachment without a filename, the subject is used as the filename, potentially tricking users into executing malicious code.

Description

Microsoft Outlook Express 4.x/5.x/6.0 - Attachment Processing File Extension Obfuscation

Exploits (1)

exploitdb WORKING POC VERIFIED
by Benjamin Tobias Franz · textremotewindows
https://www.exploit-db.com/exploits/25784

This exploit leverages a file extension obfuscation vulnerability in Microsoft Outlook Express to bypass attachment security warnings. By crafting an EML attachment without a filename, the subject is used as the filename, potentially tricking users into executing malicious code.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Trivial
Reliability
Reliable
Target: Microsoft Outlook Express (versions affected in 2005)
No auth needed
Prerequisites: Victim must open the malicious email attachment in Outlook Express
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026