{"id":"CVE-2025-64998","aliases":["EUVD-2025-208958","GHSA-6642-x6x4-g343","UBUNTU-CVE-2025-64998"],"status":"published","title":"Session hijacking via exposed session signing secret in distributed Checkmk setups","description":"Exposure of session signing secret in Checkmk \u003c2.4.0p23, \u003c2.3.0p45 and 2.2.0 allows an administrator of a remote site with config sync enabled to hijack sessions on the central site by forging session cookies.","severity":{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00355,"percentile":0.29641,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-522"],"published":"2026-03-24T11:25:58Z","modified":"2026-10-28T02:30:42Z","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/18954","tags":["vendor-advisory","Vendor Advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-64998","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-6642-x6x4-g343"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/64xxx/CVE-2025-64998.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-64998","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-64998","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2025-64998","title":"Session hijacking via exposed session signing secret in distributed Checkmk setups","description":"Exposure of session signing secret in Checkmk \u003c2.4.0p23, \u003c2.3.0p45 and 2.2.0 allows an administrator of a remote site with config sync enabled to hijack sessions on the central site by forging session 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an...","description":"Exposure of session signing secret in Checkmk \u003c2.4.0p23, \u003c2.3.0p45 and 2.2.0 allows an administrator of a remote site with config sync enabled to hijack sessions on the central site by forging session cookies.","status":"published","published":"2026-03-24T12:30:25Z","modified":"2026-05-12T15:31:15Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/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":"high"},{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-522"],"updated_at":"2026-11-02T15:08:03.879292Z"}],"nvd":[{"id":"CVE-2025-64998","description":"Exposure of session signing secret in Checkmk \u003c2.4.0p23, \u003c2.3.0p45 and 2.2.0 allows an administrator of a remote site with config sync enabled to hijack sessions on the central site by forging session 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cookies.","status":"published","published":"2026-03-24T11:25:58.183Z","modified":"2026-10-28T02:30:42.964249751Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-522"],"updated_at":"2026-11-02T15:44:51.851511Z"},{"id":"UBUNTU-CVE-2025-64998","description":"Exposure of session signing secret in Checkmk \u003c2.4.0p23, \u003c2.3.0p45 and 2.2.0 allows an administrator of a remote site with config sync enabled to hijack sessions on the central site by forging session cookies.","status":"published","published":"2026-03-24T12:16:00Z","modified":"2026-05-14T14:21:49.595562Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"},{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T16:55:52.345622Z"}]}}