{"affected":[{"defaultStatus":"unaffected","product":"FortiOS","source":"CNA: fortinet","vendor":"Fortinet","versions":[{"lessThanOrEqual":"7.6.4","status":"affected","version":"7.6.0","versionType":"semver"},{"lessThanOrEqual":"7.4.9","status":"affected","version":"7.4.0","versionType":"semver"},{"lessThanOrEqual":"7.2.13","status":"affected","version":"7.2.0","versionType":"semver"},{"lessThanOrEqual":"7.0.19","status":"affected","version":"7.0.0","versionType":"semver"},{"lessThanOrEqual":"6.4.16","status":"affected","version":"6.4.0","versionType":"semver"}]}],"cveId":"CVE-2026-121528","cwes":["CWE-295"],"description":"A improper certificate validation vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2.0 through 7.2.13 may allow a remote and unauthenticated attacker to perform a Man-in-the-Middle attack on the communication channel between the SSLVPN web portal and the backend destination website.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":7.7,"severity":"high","source":"CNA: fortinet","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C","version":"3.1"}],"modifiedAt":1794432713978,"publishedAt":1794432713978,"references":[{"source":"CNA: fortinet","tags":[],"url":"https://fortiguard.fortinet.com/psirt/FG-IR-26-193"}],"remediation":[{"kind":"fix","source":"CNA: fortinet","text":"Upgrade to FortiOS version 8.0.0 or above\nUpgrade to FortiOS version 7.6.5 or above\nUpgrade to FortiOS version 7.4.10 or above\nUpgrade to FortiOS version 7.2.14 or above"}],"revision":"c399606707fa11ca7a2c3efa9d6e6680a90f348562864069d6f6626e77d79ae2","sources":[{"modifiedAt":1794432713978,"name":"CNA: fortinet","retrievedAt":1794434925709,"url":"https://www.cve.org/CVERecord?id=CVE-2026-121528"}],"ssvc":null,"status":"published","title":"CVE-2026-121528","updatedAt":1794434925709}