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CVE-2026-3869 is a critical incorrect implementation of an authentication algorithm in Schneider Electric Modicon M580 and Modicon M580 Safety programmable logic controllers. The vulnerability occurs when an application project with a lower application level is running on the PLC, allowing authentication protections to be incorrectly enforced. The issue is rated CVSS 4.0 9.2 (Critical).
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No public exploit code observed for this vulnerability.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An incorrect implementation of an authentication algorithm (CWE-303) in a PLC that can compromise confidentiality, integrity, and availability when an application project with a lower application level is running on the PLC.
A critical, remotely exploitable incorrect authentication-algorithm implementation vulnerability in Schneider Electric Modicon PLCs. It may allow loss of confidentiality, integrity, and availability when a lower-application-level project is running on the PLC.
A critical authentication vulnerability (CVSS 9.2) affecting Schneider Electric Modicon M580 and Modicon M580 Safety controllers.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.