{"id":"CVE-2026-8078","aliases":["EUVD-2026-35052","GHSA-c2x3-wx4h-g26v","UBUNTU-CVE-2026-8078"],"status":"published","title":"Fix stored XSS in global settings change log","description":"Stored cross-site scripting in the global settings change log in Checkmk \u003c2.5.0p5, \u003c2.4.0p31, \u003c2.3.0p48, and all 2.2.0 versions allows an administrator who can change global settings to store malicious HTML or JavaScript in changelog messages that executes in other users' browsers when they view the Activate Changes page or Audit log.","severity":{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00143,"percentile":0.03594,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-06-08T12:06:36Z","modified":"2026-10-28T02:30:58Z","affected":[{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"check-mk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.6p5-1","1.2.6p12-1","1.2.6p12-1ubuntu0.16.04.1","1.2.6p12-1ubuntu0.16.04.1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"check-mk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.8p16-1ubuntu0.1","1.2.8p16-1ubuntu0.2"]}],"products":[{"vendor":"checkmk","product":"checkmk"},{"vendor":"checkmk gmbh","product":"checkmk"}],"references":[{"url":"https://checkmk.com/werk/17992","tags":["vendor-advisory","Vendor Advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8078","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-c2x3-wx4h-g26v"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8078.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-8078","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-8078","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-8078","title":"Fix stored XSS in global settings change log","description":"Stored cross-site scripting in the global settings change log in Checkmk \u003c2.5.0p5, \u003c2.4.0p31, \u003c2.3.0p48, and all 2.2.0 versions allows an administrator who can change global settings to store malicious HTML or JavaScript in changelog messages that executes in other users' browsers when they view the Activate Changes page or 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log.","status":"published","published":"2026-06-08T13:16:33.76Z","modified":"2026-10-23T22:10:00.16Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/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","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:22.73178Z"}],"osv":[{"id":"CVE-2026-8078","title":"Fix stored XSS in global settings change log","description":"Stored cross-site scripting in the global settings change log in Checkmk \u003c2.5.0p5, \u003c2.4.0p31, \u003c2.3.0p48, and all 2.2.0 versions allows an administrator who can change global settings to store malicious HTML or JavaScript in changelog messages that executes in other users' browsers when they view the Activate Changes page or Audit log.","status":"published","published":"2026-06-08T12:06:36.666Z","modified":"2026-10-28T02:30:58.04977738Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:17.773945Z"},{"id":"UBUNTU-CVE-2026-8078","description":"Stored cross-site scripting in the global settings change log in Checkmk \u003c2.5.0p5, \u003c2.4.0p31, \u003c2.3.0p48, and all 2.2.0 versions allows an administrator who can change global settings to store malicious HTML or JavaScript in changelog messages that executes in other users' browsers when they view the Activate Changes page or Audit log.","status":"published","published":"2026-06-08T13:16:00Z","modified":"2026-06-11T13:02:01Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N","level":"medium"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:57:18.015985Z"}]}}