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Incorrect authentication algorithm implementation in Schneider Electric Modicon M580 controllers
CVE-2026-3869 is an incorrect implementation of an authentication algorithm in Schneider Electric Modicon M580 and Modicon M580 Safety programmable logic controllers. Exploitation requires an application project with a lower application level to be running on the PLC. The vulnerability can compromise the affected controller's confidentiality, integrity, and availability. Specific affected versions and details of the vulnerable authentication routine are not available.
What it means and what to do now: patch path, interim mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Successful exploitation could compromise the confidentiality, integrity, and availability of the affected PLC. The specific information exposed, modifications possible, and mechanism or duration of service disruption are not established.
Patch, then assume compromise.
Apply Schneider Electric security updates for Modicon M580 and Modicon M580 Safety controllers addressing CVE-2026-3869. Specific affected and fixed versions are not available in the provided information; consult the applicable Schneider Electric advisory and product update guidance before deployment.
No public exploits tracked yet. Mallory keeps watching.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.