WAGO Controllers Allow Privilege Bypass via WBM
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CISA advisory details two WAGO Linux firmware flaws letting low-privileged WBM users bypass routing and PROFIBUS authorization controls.
CISA published an ICS advisory covering WAGO OS Linux firmware running on a broad range of WAGO industrial controllers (CC100, PFC100 G2, PFC200 G2, TP600, Edge Controller, WP400, and numerous hardware model variants). Two vulnerabilities exist in the Web-Based Management (WBM) interface: an authorization bypass affecting routing configuration functionality, and a separate authorization bypass affecting the PROFIBUS configuration management authorization model. Both allow an authenticated, low-privileged user to exceed their intended privilege boundaries within the WBM interface. A related CWE-78 OS Command Injection weakness is also noted in the advisory metrics, though full details were truncated.
Affected firmware spans versions from 1.0.0 up to but not including 4.10.0, installed across a large list of WAGO hardware product codes (0751-9x01, 0750-811x series, 0750-821x series, 0762-4xx/5xx/6xx-8000 series, 0752-8303-8000-0002, 0762-340x, and more). These are industrial PLCs and edge controllers deployed worldwide across critical infrastructure sectors including chemical, critical manufacturing, commercial facilities, energy, transportation, and water/wastewater — WAGO is headquartered in Germany. No indication of active exploitation in the wild is given in the advisory; this is a vendor-disclosed vulnerability notice.
WAGO recommends updating affected devices to firmware Version 4.10.0 (FW32) or higher, with custom firmware available via WAGO support. Additional mitigations include following the general security hardening guidance in the PFC100/PFC200 manuals (Section 6: restricting physical access; Section 7: VPN use for remote access). Further details are available in WAGO's own security advisory VDE-2026-096 and the associated CSAF document.
Mentioned in this report
Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-26-293-02
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