EIP-2026-115629

PRE-CVE

Microsoft Compiled HTML Help / Uncompiled .chm File - XML External Entity Injection

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-115629. PoCs published by hyp3rlinx.

AI-analyzed exploit summary This exploit demonstrates an XML External Entity (XXE) injection vulnerability in Microsoft Compiled HTML Help (CHM) files by bypassing the standard compilation process. It exfiltrates local files (e.g., C:\Windows\system.ini) via a crafted .chm.chm file and a malicious DTD hosted on a local server.

Description

Microsoft Compiled HTML Help / Uncompiled .chm File - XML External Entity Injection

Exploits (1)

exploitdb WORKING POC VERIFIED
by hyp3rlinx · textdoswindows
https://www.exploit-db.com/exploits/47127

This exploit demonstrates an XML External Entity (XXE) injection vulnerability in Microsoft Compiled HTML Help (CHM) files by bypassing the standard compilation process. It exfiltrates local files (e.g., C:\Windows\system.ini) via a crafted .chm.chm file and a malicious DTD hosted on a local server.

Classification
Working Poc 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Microsoft Compiled HTML Help (hh.exe)
No auth needed
Prerequisites: User interaction to open the .chm.chm file · Local or remote server to host the malicious DTD file
devstral-2 · analyzed Feb 18, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026