{"id":"CVE-2020-5299","aliases":["GHSA-4rhm-m2fp-hx7q"],"url":"https://o3.security/vulnerability/CVE-2020-5299","summary":"Potential CSV Injection vector in OctoberCMS","details":"In OctoberCMS (october/october composer package) versions from 1.0.319 and before 1.0.466, any users with the ability to modify any data that could eventually be exported as a CSV file from the `ImportExportController` could potentially introduce a CSV injection into the data to cause the generated CSV export file to be malicious. This requires attackers to achieve the following before a successful attack can be completed: 1. Have found a vulnerability in the victims spreadsheet software of choice. 2. Control data that would potentially be exported through the `ImportExportController` by a theoretical victim. 3. Convince the victim to export above data as a CSV and run it in vulnerable spreadsheet software while also bypassing any sanity checks by said software. Issue has been patched in Build 466 (v1.0.466).","published":"2020-06-03T22:15:11.957Z","modified":"2026-08-07T15:14:32.204926Z","cvss":{"score":5.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L"},"epss":{"score":0.01002,"percentile":0.59745,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"october/backend","fixedVersion":"1.0.466"}],"fix":{"url":"https://github.com/octobercms/library/commit/c84bf03f506052c848f2fddc05f24be631427a1a","label":"octobercms/library@c84bf03"},"references":[{"type":"ADVISORY","url":"http://packetstormsecurity.com/files/158730/October-CMS-Build-465-XSS-File-Read-File-Deletion-CSV-Injection.html"},{"type":"ADVISORY","url":"http://seclists.org/fulldisclosure/2020/Aug/2"},{"type":"FIX","url":"https://github.com/octobercms/library/commit/c84bf03f506052c848f2fddc05f24be631427a1a"},{"type":"FIX","url":"https://github.com/octobercms/october/commit/802d8c8e09a2b342649393edb6d3ceb958851484"},{"type":"FIX","url":"https://github.com/octobercms/october/security/advisories/GHSA-4rhm-m2fp-hx7q"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T15:14:32.204926Z"}}