CVE-2026-3869
Critical
Description
CWE-303 : Incorrect Implementation of Authentication Algorithm vulnerability exists that could cause loss of confidentiality, integrity and availability of the PLC provided an application project with a lower application level is running on the PLC.
SeverityCritical
CVSS9.2
Exploit probability46. percentile0.5%
ProductModicon M580
PublishedSep 11, 2026
First seenSep 11, 2026
Weakness typeCWE-303CWE-303
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Schneider Electric Modicon M580 | All versions with an application level below 4.00 | — |
| Schneider Electric Modicon M580 Safety | All versions with an application level below 4.20 | — |
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