{"id":"CVE-2020-15159","aliases":["EUVD-2020-0597","GHSA-673x-f5wx-fxpw"],"status":"published","title":"Cross Site Scripting leading to RCE in baserCMS","description":"baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) and Remote Code Execution (RCE). This may be executed by logging in as a system administrator and uploading an executable script file such as a PHP file.The affected components are ThemeFilesController.php and UploaderFilesController.php. This is fixed in version 4.3.7.","severity":{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.02152,"percentile":0.82409,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2020-08-28T21:45:15Z","modified":"2026-10-20T10:51:52Z","fixes":[{"ecosystem":"Packagist","package":"baserproject/basercms","fixed_in":["4.3.7"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"baserproject/basercms","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"last_affected":"4.3.6"},{"fixed":"4.3.7"}]}]},{"source":"osv","ecosystem":"Packagist","package":"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"]}],"products":[{"vendor":"basercms","product":"basercms"},{"vendor":"baserproject","product":"basercms"}],"references":[{"url":"https://basercms.net/security/20200827","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory","web"]},{"url":"https://github.com/baserproject/basercms/security/advisories/GHSA-673x-f5wx-fxpw","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/baserproject/basercms/commit/16a7b3cd09a0ca355474119c76897eac2034a66d","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-15159","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-673x-f5wx-fxpw"}],"sources":{"cve":[{"id":"CVE-2020-15159","title":"Cross Site Scripting leading to RCE in baserCMS","description":"baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) and Remote Code Execution (RCE). This may be executed by logging in as a system administrator and uploading an executable script file such as a PHP file.The affected components are ThemeFilesController.php and UploaderFilesController.php. This is fixed in version 4.3.7.","status":"published","published":"2020-08-28T21:55:14Z","modified":"2024-08-04T13:08:22.439Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:35:50.228781Z"}],"euvd":[{"id":"EUVD-2020-0597","description":"baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) and Remote Code Execution (RCE). This may be executed by logging in as a system administrator and uploading an executable script file such as a PHP file.The affected components are ThemeFilesController.php and UploaderFilesController.php. This is fixed in version 4.3.7.","status":"published","published":"2020-08-28T21:55:14Z","modified":"2024-08-04T13:08:22Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T03:07:32.55679Z"}],"ghsa":[{"id":"GHSA-673x-f5wx-fxpw","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/)","status":"published","published":"2020-08-28T21:45:15Z","modified":"2023-01-09T05:03:48Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:36:06.317379Z"}],"nvd":[{"id":"CVE-2020-15159","description":"baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) and Remote Code Execution (RCE). This may be executed by logging in as a system administrator and uploading an executable script file such as a PHP file.The affected components are ThemeFilesController.php and UploaderFilesController.php. This is fixed in version 4.3.7.","status":"published","published":"2020-08-28T22:15:10.657Z","modified":"2026-06-17T02:56:10.11Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":4.6,"vector":"AV:N/AC:H/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:06:13.600965Z"}],"osv":[{"id":"CVE-2020-15159","description":"baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) and Remote Code Execution (RCE). This may be executed by logging in as a system administrator and uploading an executable script file such as a PHP file.The affected components are ThemeFilesController.php and UploaderFilesController.php. This is fixed in version 4.3.7.","status":"published","published":"2020-08-28T22:15:10.657Z","modified":"2026-10-20T10:51:52.194070305Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:14.828228Z"},{"id":"GHSA-673x-f5wx-fxpw","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/)","status":"published","published":"2020-08-28T21:45:15Z","modified":"2026-09-10T03:48:30.979460313Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:39.266402Z"}]}}