CyberSecBulletin
CVE-2026-3000NVD status: Analyzed

IDExpert Windows Logon Agent: Download of Code Without Integrity Check

Published Updated By the CyberSecBulletin desk

CVE-2026-3000 is a critical-severity download of code without integrity check vulnerability in IDExpert Windows Logon Agent from Changing, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected IDExpert Windows Logon Agent versions: 2.7.3.230719 through 2.8.4.250925. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.56% chance of exploitation within 30 days, which is low compared with other CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Check which version of IDExpert Windows Logon Agent you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on changingtec.com for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
ChangingIDExpert Windows Logon Agent2.7.3.230719 through 2.8.4.250925Not stated
ChangingtecIdexpert2.7.3.230719 through 2.8.4.250925Not stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (cert.org.tw).

Scoring systemScoreSeverityScored by
CVSS 4.09.3CriticalCNA (cert.org.tw)
CVSS 3.19.8CriticalCNA (cert.org.tw)

Official description

IDExpert Windows Logon Agent developed by Changing has a Remote Code Execution vulnerability, allowing unauthenticated remote attackers to force the system to download arbitrary DLL files from a remote source and execute them.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Download of Code Without Integrity Check

The product downloads source code or an executable from a remote location and executes the code without sufficiently verifying the origin and integrity of the code.

How developers prevent this class of flaw

  • Perform proper forward and reverse DNS lookups to detect DNS spoofing.
  • Encrypt the code with a reliable encryption scheme before transmitting.
  • Run your code using the lowest privileges that are required to accomplish the necessary tasks. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.

More Download of Code Without Integrity Check vulnerabilities (CWE-494)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Other vulnerabilities in IDExpert Windows Logon Agent

All IDExpert Windows Logon Agent vulnerabilities

Recent Download of Code Without Integrity Check vulnerabilities

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