{"id":"GHSA-673x-f5wx-fxpw","aliases":["CVE-2020-15159"],"title":"Cross Site Scripting and RCE in baserCMS","description":"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/)","severity":"high","score":7.6,"published":"2020-08-28T21:45:15.000Z","modified":"2026-09-10T03:48:30.979Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"baserproject/basercms","ranges":[{"events":[{"introduced":"4.0.0"},{"fixed":"4.3.7"}],"type":"ECOSYSTEM"}],"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"],"fixed":["4.3.7"]}],"references":["https://github.com/baserproject/basercms/security/advisories/GHSA-673x-f5wx-fxpw","https://nvd.nist.gov/vuln/detail/CVE-2020-15159","https://github.com/baserproject/basercms/commit/16a7b3cd09a0ca355474119c76897eac2034a66d","https://basercms.net/security/20200827"],"sources":[{"name":"OSV","id":"GHSA-673x-f5wx-fxpw","modified":"2026-09-10T03:48:30.979460313Z","url":"https://osv.dev/vulnerability/GHSA-673x-f5wx-fxpw"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H","score":7.6}]}