EIP-2026-118853

PRE-CVE

Microsoft Lync 2010 4.0.7577.0 - User-Agent Header Handling Arbitrary Command Execution

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-118853. PoCs published by Christopher Emerson.

AI-analyzed exploit summary This exploit demonstrates a cross-site scripting (XSS) vulnerability in Microsoft Lync by injecting malicious JavaScript into the User-Agent header. The script executes an ActiveX object to launch Notepad, showcasing arbitrary command execution in the context of the victim's browser.

Description

Microsoft Lync 2010 4.0.7577.0 - User-Agent Header Handling Arbitrary Command Execution

Exploits (1)

exploitdb WORKING POC VERIFIED
by Christopher Emerson · textremotewindows
https://www.exploit-db.com/exploits/38227

This exploit demonstrates a cross-site scripting (XSS) vulnerability in Microsoft Lync by injecting malicious JavaScript into the User-Agent header. The script executes an ActiveX object to launch Notepad, showcasing arbitrary command execution in the context of the victim's browser.

Classification
Working Poc 90%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: Microsoft Lync (version unspecified)
No auth needed
Prerequisites: Victim must visit a crafted URL or have their request intercepted · ActiveX must be enabled in the victim's browser
MITRE ATT&CK
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026