CVE-2026-25939: FUXA Unauthenticated Remote Arbitrary Scheduler Write
Summary An authorization bypass vulnerability in the FUXA allows an unauthenticated, remote attacker to create and modify arbitrary schedulers, exposing connected ICS/SCADA environments to follow-on actions. This vulnerability affects FUXA version 1.2.8 through version 1.2.10. This has been patched in FUXA version 1.2.11.
Impact This affects all deployments, including those with runtime.settings.secureEnabled set to true.
Exploitation allows an unauthenticated, remote attacker to automatically authenticate as guest and create, modify or delete schedules. These schedules can be configured to trigger immediately or cyclically, forcing connected devices to specific states or values, or executing existing scripts on the server.
Patches
This issue has been patched in FUXA version 1.2.11. Users are strongly encouraged to update to the latest available release.
Other sources
FUXA is a web-based Process Visualization (SCADA/HMI/Dashboard) software. From 1.2.8 through version 1.2.10, an authorization bypass vulnerability in the FUXA allows an unauthenticated, remote attacker to create and modify arbitrary schedulers, exposing connected ICS/SCADA environments to follow-on actions. This has been patched in FUXA version 1.2.11.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-25939?
CVE-2026-25939 is rated as a high severity vulnerability allowing unauthorized remote access to create and modify schedulers.
How do I fix CVE-2026-25939?
To fix CVE-2026-25939, update the FUXA software to version 1.2.11 or later.
Who is affected by CVE-2026-25939?
CVE-2026-25939 affects users of FUXA versions between 1.2.8 and 1.2.10.
What can an attacker do with CVE-2026-25939?
An attacker exploiting CVE-2026-25939 can remotely create and modify arbitrary schedulers, potentially compromising connected ICS/SCADA environments.
Is CVE-2026-25939 an authenticated vulnerability?
No, CVE-2026-25939 is an unauthenticated vulnerability, allowing remote attackers to exploit it without prior authentication.