{"id":"CVE-2020-8866","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-8866","generatedAt":"2026-10-27T22:32:26.927Z","title":"This vulnerability allows remote attackers to create arbitrary files on affected installations of Horde Groupware Webmail Edition 5.2.22.","description":"This vulnerability allows remote attackers to create arbitrary files on affected installations of Horde Groupware Webmail Edition 5.2.22. Authentication is required to exploit this vulnerability. The specific flaw exists within add.php. The issue results from the lack of proper validation of user-supplied data, which can allow the upload of arbitrary files. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of the www-data user. Was ZDI-CAN-10125.","published":"2020-03-23T21:15:13.000Z","lastModified":"2026-06-17T03:27:06.000Z","status":"Modified","sourceIdentifier":"zdi-disclosures@trendmicro.com","cvss":{"version":"3.1","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},"cwe":["CWE-434"],"affected":["horde/groupware","horde/horde form","debian/debian linux"],"epss":{"score":0.09579,"percentile":0.95437,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":2,"verified":false,"firstPublished":"2020-03-11","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":48210,"kind":"exploit","title":"Horde Groupware Webmail Edition 5.2.22 - PHAR Loading","url":"https://www.exploit-db.com/exploits/48210","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/php/webapps/48210.py","file":"exploits/php/webapps/48210.py","published":"2020-03-11","added":"2020-03-12","updated":"2020-03-12","author":"Andrea Cardaci","type":"webapps","platform":"php","port":null,"verified":false,"codes":["CVE-2020-8866","CVE-2020-8865"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":"https://cardaci.xyz/advisories/2020/03/11/horde-groupware-webmail-edition-5.2.22-multiple-vulnerabilities-promote-file-upload-in-temp-folder-to-rce/"},{"edbId":48209,"kind":"exploit","title":"Horde Groupware Webmail Edition 5.2.22 - PHP File Inclusion","url":"https://www.exploit-db.com/exploits/48209","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/php/webapps/48209.py","file":"exploits/php/webapps/48209.py","published":"2020-03-11","added":"2020-03-12","updated":"2020-03-12","author":"Andrea Cardaci","type":"webapps","platform":"php","port":null,"verified":false,"codes":["CVE-2020-8866","CVE-2020-8865"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":"https://cardaci.xyz/advisories/2020/03/11/horde-groupware-webmail-edition-5.2.22-multiple-vulnerabilities-promote-file-upload-in-temp-folder-to-rce/"}]},"verdict":{"level":"high","text":"2 public exploits are published in Exploit-DB, so the technical barrier is gone even though the severity is medium and EPSS is 9.6%. Treat it as high on anything reachable from the internet."},"changes":[],"references":[{"url":"https://lists.debian.org/debian-lts-announce/2020/03/msg00036.html","tags":["Mailing List","Third Party Advisory"],"source":"zdi-disclosures@trendmicro.com"},{"url":"https://lists.horde.org/archives/announce/2020/001288.html","tags":["Mailing List","Vendor Advisory"],"source":"zdi-disclosures@trendmicro.com"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-20-275/","tags":["Third Party Advisory","VDB Entry"],"source":"zdi-disclosures@trendmicro.com"},{"url":"https://lists.debian.org/debian-lts-announce/2020/03/msg00036.html","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.horde.org/archives/announce/2020/001288.html","tags":["Mailing List","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-20-275/","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-8866","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."}