{"id":"CVE-2025-48953","summary":"Umbraco Vulnerable to By-Pass of Configured Allowed Extensions for File Uploads","details":"Umbraco is an ASP.NET content management system (CMS). Starting in version 14.0.0 and prior to versions 15.4.2 and 16.0.0, it's possible to upload a file that doesn't adhere with the configured allowable file extensions via a manipulated API request. The issue is patched in versions 15.4.2 and 16.0.0. No known workarounds are available.","aliases":["GHSA-fr6r-p8hv-x3c4"],"modified":"2026-08-12T03:51:35.549731574Z","published":"2025-06-03T18:19:28.771Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-434"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48953.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48953.json"},{"type":"ADVISORY","url":"https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-fr6r-p8hv-x3c4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-48953"},{"type":"FIX","url":"https://github.com/umbraco/Umbraco-CMS/commit/d920e93d1ee29dc3301697e444f53e8cd5db3cf9"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/umbraco/umbraco-cms","events":[{"introduced":"8685c7d64a1c597983cfb82e1bd1d269d22e4508"},{"fixed":"d920e93d1ee29dc3301697e444f53e8cd5db3cf9"}],"database_specific":{"source":["AFFECTED_FIELD","CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"14.0.0"},{"fixed":"15.4.2"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-48953.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L"}]}