{"id":"CVE-2016-6851","url":"https://www.cyber-defence.io/tools/cve/CVE-2016-6851","generatedAt":"2026-10-28T21:17:41.346Z","title":"This allows cross-site scripting attacks against arbitrary users since no prior authentication is needed.","description":"An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5. Script code can be provided as parameter to the OX Guard guest reader web application. This allows cross-site scripting attacks against arbitrary users since no prior authentication is needed. Malicious script code can be executed within a user's context. This can lead to session hijacking or triggering unwanted actions via the web interface (sending mail, deleting data etc.) in case the user has an active session on the same domain already.","published":"2016-12-15T06:59:23.000Z","lastModified":"2026-06-17T00:51:53.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":6.1,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":["open-xchange/ox guard"],"epss":{"score":0.02643,"percentile":0.85509,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2016-09-13","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":40377,"kind":"exploit","title":"Open-Xchange Guard 2.4.2 - Multiple Cross-Site Scripting Vulnerabilities","url":"https://www.exploit-db.com/exploits/40377","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/linux/webapps/40377.txt","file":"exploits/linux/webapps/40377.txt","published":"2016-09-13","added":"2016-09-13","updated":"2016-10-14","author":"Benjamin Daniel Mussler","type":"webapps","platform":"linux","port":null,"verified":false,"codes":["CVE-2016-6854","CVE-2016-6853","CVE-2016-6851"],"tags":null,"aliases":null,"applicationUrl":"http://www.exploit-db.comopen-xchange-guard_2.4.2.orig.tar.bz2","screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"high","text":"A public exploit is published in Exploit-DB, so the technical barrier is gone even though the severity is medium and EPSS is 2.6%. Treat it as high on anything reachable from the internet."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/138701/Open-Xchange-Guard-2.4.2-Cross-Site-Scripting.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/archive/1/539395/100/0/threaded","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/92920","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://www.exploit-db.com/exploits/40377/","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://packetstormsecurity.com/files/138701/Open-Xchange-Guard-2.4.2-Cross-Site-Scripting.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/archive/1/539395/100/0/threaded","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/92920","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/40377/","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2016-6851","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}