{"affected":[{"defaultStatus":"unaffected","product":"Checkmk","source":"CNA: Checkmk","vendor":"Checkmk GmbH","versions":[{"lessThan":"2.5.0p19","status":"affected","version":"2.5.0","versionType":"semver"},{"lessThan":"2.4.0p40","status":"affected","version":"2.4.0","versionType":"semver"},{"status":"affected","version":"2.3.0","versionType":"semver"}]}],"cveId":"CVE-2026-120495","cwes":["CWE-23"],"description":"Path traversal in the Synthetic Monitoring \"Robotmk\" test service of Checkmk <2.5.0p19, <2.4.0p40, and 2.3.0 (EOL) allows an attacker who controls the agent output of a monitored host's check output for a host to inject a crafted robot output to define the contents and location for the generated HTML log, leading to code execution as the site user.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":9.4,"severity":"critical","source":"CNA: Checkmk","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0"},{"score":9.4,"severity":"critical","source":"NVD: security@checkmk.com","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"}],"modifiedAt":1794395833547,"publishedAt":1794393993920,"references":[{"source":"CNA: Checkmk","tags":["vendor-advisory"],"url":"https://checkmk.com/werk/22624"},{"source":"security@checkmk.com","tags":[],"url":"https://checkmk.com/werk/22624"}],"remediation":[],"revision":"08a8c35bcdcca05c37b050f127c37f241720429fedb37e882996065dd65ec85c","sources":[{"modifiedAt":1794393993920,"name":"CNA: Checkmk","retrievedAt":1794395324988,"url":"https://www.cve.org/CVERecord?id=CVE-2026-120495"},{"modifiedAt":1794395833547,"name":"NVD","retrievedAt":1794399485023,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120495"}],"ssvc":null,"status":"published","title":"Arbitrary file write and code execution via crafted Synthetic Monitoring agent data","updatedAt":1794399485023}