{"id":"CVE-2017-9781","aliases":["EUVD-2017-18711","GHSA-85cm-vx4m-p4x4","UBUNTU-CVE-2017-9781","USN-5527-1","USN-5527-2"],"status":"published","title":"A cross site scripting (XSS) vulnerability exists in Check_MK versions 1.4.0x prior to 1.4.0p6,...","description":"A cross site scripting (XSS) vulnerability exists in Check_MK versions 1.4.0x prior to 1.4.0p6, allowing an unauthenticated remote attacker to inject arbitrary HTML or JavaScript via the _username parameter when attempting authentication to webapi.py, which is returned unencoded with content type text/html.","severity":{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01446,"percentile":0.73483,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2017-06-21T18:00:00Z","modified":"2026-10-24T10:30:41Z","fixes":[{"ecosystem":"Ubuntu:Pro:16.04:LTS","package":"check-mk","fixed_in":["1.2.6p12-1ubuntu0.16.04.1+esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"check-mk","fixed_in":["1.2.8p16-1ubuntu0.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"check-mk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.6p12-1ubuntu0.16.04.1+esm1"}]}],"versions":["1.2.6p5-1","1.2.6p12-1","1.2.6p12-1ubuntu0.16.04.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"check-mk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.8p16-1ubuntu0.2"}]}],"versions":["1.2.8p16-1ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"check-mk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.8p16-1ubuntu0.2"}]}],"versions":["1.2.8p16-1ubuntu0.1"],"bundled":5},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"check-mk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.6p12-1ubuntu0.16.04.1+esm1"}]}],"versions":["1.2.6p5-1","1.2.6p12-1","1.2.6p12-1ubuntu0.16.04.1"],"bundled":4}],"products":[{"vendor":"check_mk_project","product":"check_mk"}],"references":[{"url":"http://git.mathias-kettner.de/git/?p=check_mk.git%3Ba=blob%3Bf=.werks/4757%3Bhb=c248f0b6ff7b15ced9f07a3df8a80fad656ea5b1","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"https://www.tenable.com/security/research/tra-2017-21","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2017-9781"},{"url":"http://git.mathias-kettner.de/git/?p=check_mk.git;a=blob;f=.werks/4757;hb=c248f0b6ff7b15ced9f07a3df8a80fad656ea5b1","tags":["report"]},{"url":"https://github.com/advisories/GHSA-85cm-vx4m-p4x4"},{"url":"https://ubuntu.com/security/CVE-2017-9781","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5527-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2017-9781","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5527-2","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2017-14955","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-36563","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-40906","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2022-24565","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2017-9781","description":"A cross site scripting (XSS) vulnerability exists in Check_MK versions 1.4.0x prior to 1.4.0p6, allowing an unauthenticated remote attacker to inject arbitrary HTML or JavaScript via the _username parameter when attempting authentication to webapi.py, which is returned unencoded with content type text/html.","status":"published","published":"2017-06-21T18:00:00Z","modified":"2024-08-05T17:18:01.918Z","updated_at":"2026-11-02T14:33:13.606903Z"}],"euvd":[{"id":"EUVD-2017-18711","description":"A cross site scripting (XSS) vulnerability exists in Check_MK versions 1.4.0x prior to 1.4.0p6, allowing an unauthenticated remote attacker to inject arbitrary HTML or JavaScript via the _username parameter when attempting authentication to webapi.py, which is returned unencoded with content type text/html.","status":"published","published":"2017-06-21T18:00:00Z","modified":"2024-08-05T17:18:01Z","updated_at":"2026-11-03T02:23:26.706423Z"}],"ghsa":[{"id":"GHSA-85cm-vx4m-p4x4","title":"A cross site scripting (XSS) vulnerability exists in Check_MK versions 1.4.0x prior to 1.4.0p6,...","description":"A cross site scripting (XSS) vulnerability exists in Check_MK versions 1.4.0x prior to 1.4.0p6, allowing an unauthenticated remote attacker to inject arbitrary HTML or JavaScript via the _username parameter when attempting authentication to webapi.py, which is returned unencoded with content type text/html.","status":"published","published":"2022-05-14T01:09:09Z","modified":"2025-04-20T03:40:27Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:01:48.455381Z"}],"nvd":[{"id":"CVE-2017-9781","description":"A cross site scripting (XSS) vulnerability exists in Check_MK versions 1.4.0x prior to 1.4.0p6, allowing an unauthenticated remote attacker to inject arbitrary HTML or JavaScript via the _username parameter when attempting authentication to webapi.py, which is returned unencoded with content type text/html.","status":"published","published":"2017-06-21T18:29:00.387Z","modified":"2026-06-17T01:28:53.517Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:03:50.782497Z"}],"osv":[{"id":"CVE-2017-9781","description":"A cross site scripting (XSS) vulnerability exists in Check_MK versions 1.4.0x prior to 1.4.0p6, allowing an unauthenticated remote attacker to inject arbitrary HTML or JavaScript via the _username parameter when attempting authentication to webapi.py, which is returned unencoded with content type text/html.","status":"published","published":"2017-06-21T18:29:00.387Z","modified":"2026-10-24T10:30:41.815821891Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:07.192756Z"},{"id":"UBUNTU-CVE-2017-9781","description":"A cross site scripting (XSS) vulnerability exists in Check_MK versions 1.4.0x prior to 1.4.0p6, allowing an unauthenticated remote attacker to inject arbitrary HTML or JavaScript via the _username parameter when attempting authentication to webapi.py, which is returned unencoded with content type text/html.","status":"published","published":"2017-06-21T18:29:00Z","modified":"2026-02-04T02:32:36.050617Z","cvss":[{"version":"3.0","score":6.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:16.154988Z"},{"id":"USN-5527-1","title":"check-mk vulnerabilities","description":"It was discovered that Checkmk incorrectly handled authentication. An attacker \ncould possibly use this issue to cause a race condition leading to information \ndisclosure. (CVE-2017-14955)\n\nIt was discovered that Checkmk incorrectly handled certain inputs. An attacker\ncould use these cross-site scripting issues to inject arbitrary html or \njavascript code to obtain sensitive information including user information, \nsession cookies and valid credentials. (CVE-2017-9781, CVE-2021-36563, \nCVE-2021-40906, CVE-2022-24565)\n","status":"published","published":"2022-07-20T08:36:48Z","modified":"2026-02-10T04:42:42Z","updated_at":"2026-11-02T16:58:16.20937Z"},{"id":"USN-5527-2","title":"check-mk vulnerabilities","description":"USN-5527-1 fixed vulnerabilities in Checkmk. This update provides the \ncorresponding update for Ubuntu 16.04 ESM.\n\nOriginal advisory details:\n\n It was discovered that Checkmk incorrectly handled authentication. An attacker \n could possibly use this issue to cause a race condition leading to information \n disclosure. (CVE-2017-14955)\n \n It was discovered that Checkmk incorrectly handled certain inputs. An attacker\n could use these cross-site scripting issues to inject arbitrary html or \n javascript code to obtain sensitive information including user information, \n session cookies and valid credentials. (CVE-2017-9781, CVE-2021-36563, \n CVE-2021-40906, CVE-2022-24565)\n","status":"published","published":"2022-07-20T10:26:46Z","modified":"2026-06-25T13:31:18.786666686Z","updated_at":"2026-11-02T16:58:16.20937Z"}]}}