{"id":"CVE-2026-115336","kind":"vulnerability","aliases":["CVE-2026-115336"],"related":[],"title":"WS_FTP Server: incorrect quota accounting lets uploaders exceed storage limits","description":"Incorrect quota accounting in Progress Software WS_FTP Server releases prior to 2025.0.5 on Windows could allow an authenticated user with upload and delete permissions to exceed storage quotas, potentially causing denial of service.","summary":"WS_FTP Server releases before 2025.0.5 on Windows miscount storage quotas. An authenticated user with upload and delete permissions can push past their quota, which can cause a denial of service.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["file-transfer","vendor","windows","ws_ftp-server"],"not_affected_if":["auth-required","no-upload-delete-users","non-windows-hosts"],"how_to_check":"- Check the installed WS_FTP Server version in the product's admin console or installation folder; versions below `2025.0.5` are in the affected range.\n- Review which accounts hold upload and delete permissions.","fix":"- WS_FTP Server: move to `2025.0.5` or later.","status":"open","published_at":"2026-11-09T17:17:10+00:00","first_seen_at":"2026-11-09T17:27:38+00:00","triaged_at":"2026-11-09T17:28:56+00:00","updated_at":"2026-11-09T17:28:56+00:00","category":"vendor","confidence":0.8,"triage":{"at":"2026-11-09T17:28:56Z","model":"claude-haiku-5-5","output":{"fix":"- WS_FTP Server: move to `2025.0.5` or later.","reach":"network","title":"WS_FTP Server: incorrect quota accounting lets uploaders exceed storage limits","impact":"low","summary":"WS_FTP Server releases before 2025.0.5 on Windows miscount storage quotas. An authenticated user with upload and delete permissions can push past their quota, which can cause a denial of service.","audience":"businesses","category":"vendor","nicknames":[],"who_cares":["ws_ftp-server","windows","file-transfer"],"confidence":0.8,"fix_status":"available","needs_auth":"yes","worst_case":"authenticated user exhausts storage and disrupts the service","analyst_note":"","how_to_check":"- Check the installed WS_FTP Server version in the product's admin console or installation folder; versions below `2025.0.5` are in the affected range.\n- Review which accounts hold upload and delete permissions.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["non-windows-hosts","no-upload-delete-users","auth-required"],"who_is_affected":"Windows installations of WS_FTP Server before 2025.0.5 where users hold both upload and delete permissions. The attacker must already have a valid account, so teams with no shared or external FTP users face lower risk.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"no","severity_if_unknown":"medium"},"cost_usd":0.000701,"input_tokens":4541,"output_tokens":493,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-115336':14A,17A '-2026':13A,16A '2025.0.5':32B,70C 'account':6A,60C 'allow':74C 'authent':39B,76C 'caus':53B,88C 'could':73C 'cve':12A,15A 'delet':44B,81C 'denial':55B,89C 'exceed':9A,84C 'file':19B 'file-transf':18B 'ftp':2A,25B,28B,65C 'ftp-server':24B 'incorrect':4A,58C 'let':7A 'limit':11A 'miscount':35B 'past':48B 'permiss':45B,82C 'potenti':87C 'prior':68C 'progress':62C 'push':47B 'quota':5A,37B,50B,59C,86C 'releas':30B,67C 'server':3A,26B,29B,66C 'servic':57B,91C 'softwar':63C 'storag':10A,36B,85C 'transfer':20B 'upload':8A,42B,79C 'user':40B,77C 'vendor':21B 'window':22B,34B,72C 'ws':1A,23B,27B,64C","nicknames":[],"mitigations":[],"who_affected":"Windows installations of WS_FTP Server before 2025.0.5 where users hold both upload and delete permissions. The attacker must already have a valid account, so teams with no shared or external FTP users face lower risk.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["filetransfer","medium","vendor","windows","wsftpserver"],"campaign_type":null,"search_a":"'-115336':14A,17A '-2026':13A,16A 'account':6A 'cve':12A,15A 'exceed':9A 'ftp':2A 'incorrect':4A 'let':7A 'limit':11A 'quota':5A 'server':3A 'storag':10A 'upload':8A 'ws':1A","search_b":"'2025.0.5':32B 'authent':39B 'caus':53B 'delet':44B 'denial':55B 'file':19B 'file-transf':18B 'ftp':25B,28B 'ftp-server':24B 'miscount':35B 'past':48B 'permiss':45B 'push':47B 'quota':37B,50B 'releas':30B 'server':26B,29B 'servic':57B 'storag':36B 'transfer':20B 'upload':42B 'user':40B 'vendor':21B 'window':22B,34B 'ws':23B,27B","search_c":"'2025.0.5':70C 'account':60C 'allow':74C 'authent':76C 'caus':88C 'could':73C 'delet':81C 'denial':89C 'exceed':84C 'ftp':65C 'incorrect':58C 'permiss':82C 'potenti':87C 'prior':68C 'progress':62C 'quota':59C,86C 'releas':67C 'server':66C 'servic':91C 'softwar':63C 'storag':85C 'upload':79C 'user':77C 'window':72C 'ws':64C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-09T17:17:10+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvss_by":"security@progress.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-115336","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115336","severity":null,"published_at":"2026-11-09T17:17:10+00:00","modified_at":"2026-11-09T17:17:11+00:00","first_seen_at":"2026-11-09T17:27:38+00:00","fetched_at":"2026-11-09T17:27:38+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}