{"id":"CVE-2026-3869","title":"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…","summary":"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…","severity":"critical","cvss":9.2,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","cwe":["CWE-303"],"vendor":"Schneider Electric","product":"Modicon M580","affected":["modicon_m580 All versions with an application level below 4.00","modicon_m580_safety All versions with an application level below 4.20"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:30:42.730","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-3869","references":[{"url":"https://download.se.com/files?p_Doc_Ref=SEVD-2026-251-04&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2026-251-04.pdf","label":"cybersecurity@se.com"}],"tags":["nvd","cve.org"],"epss":0.00543,"epssPercentile":0.44517,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-11T19:14:31.513263Z"},"cvssSource":"cna","ingestedAt":"2026-09-14T00:35:28.534Z","slug":"CVE-2026-3869","body":"## Overview\n\nCWE-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":50.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}