{"id":"CVE-2025-66548","aliases":["EUVD-2025-201466","GHSA-xjvq-xvr7-xpg6"],"status":"published","title":"Nextcloud Deck app allows to spoof file extensions by using RTLO characters","description":"Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.12.7, 1.14.4, and 1.15.1, file extension can be spoofed by using RTLO characters, tricking users into download files with a different extension than what is displayed. This vulnerability is fixed in 1.12.7, 1.14.4, and 1.15.1.","severity":{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00165,"percentile":0.05742,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-116"],"published":"2025-12-05T17:26:11Z","modified":"2026-10-28T02:30:45Z","products":[{"vendor":"kiteworks","product":"security-advisories"},{"vendor":"nextcloud","product":"deck"},{"vendor":"nextcloud","product":"security-advisories"}],"references":[{"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6","tags":["x_refsource_CONFIRM","Patch","Vendor Advisory","advisory"]},{"url":"https://github.com/nextcloud/deck/pull/6671","tags":["x_refsource_MISC","Issue Tracking","fix"]},{"url":"https://github.com/nextcloud/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185a","tags":["x_refsource_MISC","Patch","fix"]},{"url":"https://hackerone.com/reports/2326618","tags":["x_refsource_MISC","Permissions Required","Vendor Advisory","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66548.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66548","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-66548","title":"Nextcloud Deck app allows to spoof file extensions by using RTLO characters","description":"Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.12.7, 1.14.4, and 1.15.1, file extension can be spoofed by using RTLO characters, tricking users into download files with a different extension than what is displayed. This vulnerability is fixed in 1.12.7, 1.14.4, and 1.15.1.","status":"published","published":"2025-12-05T17:26:11.306Z","modified":"2025-12-08T20:12:07.012Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-116"],"updated_at":"2026-11-02T14:32:53.157279Z"}],"euvd":[{"id":"EUVD-2025-201466","description":"Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.12.7, 1.14.4, and 1.15.1, file extension can be spoofed by using RTLO characters, tricking users into download files with a different extension than what is displayed. This vulnerability is fixed in 1.12.7, 1.14.4, and 1.15.1.","status":"published","published":"2025-12-05T17:26:11Z","modified":"2025-12-08T20:12:07Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T19:49:08.541096Z"}],"nvd":[{"id":"CVE-2025-66548","description":"Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.12.7, 1.14.4, and 1.15.1, file extension can be spoofed by using RTLO characters, tricking users into download files with a different extension than what is displayed. This vulnerability is fixed in 1.12.7, 1.14.4, and 1.15.1.","status":"published","published":"2025-12-05T18:15:57.967Z","modified":"2026-10-15T21:10:00.327Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-116"],"updated_at":"2026-11-02T14:11:49.093461Z"}],"osv":[{"id":"CVE-2025-66548","title":"Nextcloud Deck app allows to spoof file extensions by using RTLO characters","description":"Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.12.7, 1.14.4, and 1.15.1, file extension can be spoofed by using RTLO characters, tricking users into download files with a different extension than what is displayed. This vulnerability is fixed in 1.12.7, 1.14.4, and 1.15.1.","status":"published","published":"2025-12-05T17:26:11.306Z","modified":"2026-10-28T02:30:45.41805457Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"cwes":["CWE-116"],"updated_at":"2026-11-02T15:44:52.202386Z"}]}}