{"id":"CVE-2026-90871","title":"Path Traversal Leading to File Deletion in Ad Hoc Transfer and Web Transfer in Progress WS_FTP Server","summary":"Improper limitation of a pathname to a restricted directory in Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could allow an unauthenticated attacker to affect files outside the intended directory.","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cvssSource":"cna","cwe":["CWE-22","CWE-73"],"vendor":"Progress Software","product":"WS_FTP Server","affected":["ws_ftp_server < 2024.0.7","ws_ftp_server < 2025.0.4"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-30T17:15:23.342163Z"},"published":"2026-10-29","updated":"2026-10-30","sourceUpdated":"2026-10-30T17:15:33.651Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90871","references":[{"url":"https://progress.lightning.force.com/lightning/r/Knowledge__kav/ka7Pb000001vl86IAA/view"}],"tags":["cve.org"],"epss":0.00265,"epssPercentile":0.18584,"ingestedAt":"2026-11-05T16:24:31.148Z","slug":"CVE-2026-90871","body":"## Overview\n\nImproper limitation of a pathname to a restricted directory in Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could allow an unauthenticated attacker to affect files outside the intended directory.\n\n## Affected\n\n- `ws_ftp_server < 2024.0.7`\n- `ws_ftp_server < 2025.0.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nBy default the affected anonymous account can only delete files it previously created; ensure it is not granted broader write/delete permissions than required on Ad Hoc Transfer and Web Transfer related directories. Contact Progress Software Technical Support for guidance on available mitigations.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}