{"id":"CVE-2021-40109","aliases":["EUVD-2021-27298","GHSA-mm62-vxgq-v5v9"],"status":"published","title":"A SSRF issue was discovered in Concrete CMS through 8.5.5. Users can access forbidden files on...","description":"A SSRF issue was discovered in Concrete CMS through 8.5.5. Users can access forbidden files on their local network. A user with permissions to upload files from external sites can upload a URL that redirects to an internal resource of any file type. The redirect is followed and loads the contents of the file from the redirected-to server. Files of disallowed types can be uploaded.","severity":{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00538,"percentile":0.45787,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-918"],"published":"2021-09-27T12:04:54Z","modified":"2026-10-24T10:30:20Z","products":[{"vendor":"concretecms","product":"concrete_cms"}],"references":[{"url":"https://hackerone.com/reports/1102105","tags":["x_refsource_MISC","x_transferred","Permissions Required","report"]},{"url":"https://documentation.concretecms.org/developers/introduction/version-history/856-release-notes","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-40109"},{"url":"https://github.com/advisories/GHSA-mm62-vxgq-v5v9"}],"sources":{"cve":[{"id":"CVE-2021-40109","description":"A SSRF issue was discovered in Concrete CMS through 8.5.5. Users can access forbidden files on their local network. A user with permissions to upload files from external sites can upload a URL that redirects to an internal resource of any file type. The redirect is followed and loads the contents of the file from the redirected-to server. Files of disallowed types can be uploaded.","status":"published","published":"2021-09-27T12:04:54Z","modified":"2024-08-04T02:27:31.592Z","updated_at":"2026-11-02T14:33:01.495293Z"}],"euvd":[{"id":"EUVD-2021-27298","description":"A SSRF issue was discovered in Concrete CMS through 8.5.5. Users can access forbidden files on their local network. A user with permissions to upload files from external sites can upload a URL that redirects to an internal resource of any file type. The redirect is followed and loads the contents of the file from the redirected-to server. Files of disallowed types can be uploaded.","status":"published","published":"2021-09-27T12:04:54Z","modified":"2024-08-04T02:27:31Z","updated_at":"2026-11-03T03:24:21.368958Z"}],"ghsa":[{"id":"GHSA-mm62-vxgq-v5v9","title":"A SSRF issue was discovered in Concrete CMS through 8.5.5. Users can access forbidden files on...","description":"A SSRF issue was discovered in Concrete CMS through 8.5.5. Users can access forbidden files on their local network. A user with permissions to upload files from external sites can upload a URL that redirects to an internal resource of any file type. The redirect is followed and loads the contents of the file from the redirected-to server. Files of disallowed types can be uploaded.","status":"published","published":"2022-05-24T19:15:51Z","modified":"2023-01-30T05:02:30Z","cwes":["CWE-918"],"updated_at":"2026-11-02T14:46:38.945282Z"}],"nvd":[{"id":"CVE-2021-40109","description":"A SSRF issue was discovered in Concrete CMS through 8.5.5. Users can access forbidden files on their local network. A user with permissions to upload files from external sites can upload a URL that redirects to an internal resource of any file type. The redirect is followed and loads the contents of the file from the redirected-to server. Files of disallowed types can be uploaded.","status":"published","published":"2021-09-27T13:15:08.107Z","modified":"2026-06-17T04:06:32.197Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5.5,"vector":"AV:N/AC:L/Au:S/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T14:06:58.933037Z"}],"osv":[{"id":"CVE-2021-40109","description":"A SSRF issue was discovered in Concrete CMS through 8.5.5. Users can access forbidden files on their local network. A user with permissions to upload files from external sites can upload a URL that redirects to an internal resource of any file type. The redirect is followed and loads the contents of the file from the redirected-to server. Files of disallowed types can be uploaded.","status":"published","published":"2021-09-27T13:15:08.107Z","modified":"2026-10-24T10:30:20.088787054Z","cvss":[{"version":"3.1","score":6.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:21.249056Z"}]}}