{"id":"GHSA-673x-f5wx-fxpw","summary":"Cross Site Scripting and RCE in baserCMS","details":"baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) and Remote Code Execution (RCE).\n\n* Impact: XSS to RCE via Arbitrary file upload.\n* Attack vector is: Administrator must be logged in.\n* Components are: ThemeFilesController.php, UploaderFilesController.php.\n* Tested baserCMS Version : 4.3.6 (Latest)\n* Affected baserCMS Version : 4.2.0 ~ 4.3.6 (XSS), 3.0.10 ~ 4.3.6 (RCE)\n* Patches : https://basercms.net/security/20200827\n\nFound by Vulnerability Research team in [Flatt Security Inc.](https://flatt.tech/)","aliases":["CVE-2020-15159"],"modified":"2026-05-08T04:44:32.536584881Z","published":"2020-08-28T21:45:15Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-79"],"severity":"LOW","github_reviewed":true,"github_reviewed_at":"2020-08-28T21:44:58Z"},"references":[{"type":"WEB","url":"https://github.com/baserproject/basercms/security/advisories/GHSA-673x-f5wx-fxpw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-15159"},{"type":"WEB","url":"https://github.com/baserproject/basercms/commit/16a7b3cd09a0ca355474119c76897eac2034a66d"},{"type":"WEB","url":"https://basercms.net/security/20200827"}],"affected":[{"package":{"name":"baserproject/basercms","ecosystem":"Packagist","purl":"pkg:composer/baserproject/basercms"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.3.7"}]}],"versions":["4.0.0","4.0.1","4.0.10","4.0.10.1","4.0.11","4.0.2","4.0.2.1","4.0.3","4.0.4","4.0.5","4.0.5.1","4.0.5.2","4.0.6","4.0.7","4.0.8","4.0.9","4.1.0","4.1.0.1","4.1.1","4.1.2","4.1.3","4.1.4","4.1.5","4.1.6","4.1.7","4.1.8","4.2.0","4.2.1","4.2.2","4.2.3","4.2.4","4.2.5","4.3.0","4.3.1","4.3.2","4.3.3","4.3.4","4.3.5","4.3.6"],"database_specific":{"last_known_affected_version_range":"\u003c= 4.3.6","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/08/GHSA-673x-f5wx-fxpw/GHSA-673x-f5wx-fxpw.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H"}]}