{"id":"CVE-2026-15198","kind":"vulnerability","aliases":["CVE-2026-15198"],"related":[],"title":"Synology DSM: missing authentication in WebDAV API exposes files","description":"A missing authentication for critical functionality vulnerability in the Webdav API in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote attackers to read specific files and conduct limited denial-of-service attacks.","summary":"Synology DiskStation Manager has a WebDAV API that performs a critical function without requiring authentication. A remote attacker can read specific files and cause limited denial of service.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["dsm","infrastructure","self-hosted","synology","webdav"],"not_affected_if":["patched-dsm","webdav-disabled"],"how_to_check":"- Check the DSM version in Control Panel > Info Center; `7.3.2-86009-5` or `7.4.1-90080-1` or later is not affected per the sources.\n- Check whether WebDAV Server is enabled in Package Center or File Services.","fix":"- DSM `7.3.2-86009-5` for the 7.3 branch\n- DSM `7.4.1-90080-1` for the 7.4 branch","status":"open","published_at":"2026-11-12T04:17:18+00:00","first_seen_at":"2026-11-12T04:47:08+00:00","triaged_at":"2026-11-12T04:47:52+00:00","updated_at":"2026-11-12T04:47:52+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-12T04:47:52Z","model":"claude-haiku-5-5","output":{"fix":"- DSM `7.3.2-86009-5` for the 7.3 branch\n- DSM `7.4.1-90080-1` for the 7.4 branch","reach":"network","title":"Synology DSM: missing authentication in WebDAV API exposes files","impact":"medium","summary":"Synology DiskStation Manager has a WebDAV API that performs a critical function without requiring authentication. A remote attacker can read specific files and cause limited denial of service.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["synology","dsm","self-hosted","webdav"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Remote attackers read specific files and cause limited denial of service","analyst_note":"","how_to_check":"- Check the DSM version in Control Panel > Info Center; `7.3.2-86009-5` or `7.4.1-90080-1` or later is not affected per the sources.\n- Check whether WebDAV Server is enabled in Package Center or File Services.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["patched-dsm","webdav-disabled"],"who_is_affected":"DSM versions before 7.3.2-86009-5 and 7.4.1-90080-1 are affected. Systems that expose the WebDAV service to the network are the main concern; the sources do not say whether the flaw requires WebDAV to be enabled.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.00072,"input_tokens":4548,"output_tokens":531,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-1':74C '-15198':12A,15A '-2026':11A,14A '-5':70C '-86009':69C '-90080':73C '7.3.2':68C '7.4.1':72C 'allow':75C 'api':7A,29B,61C 'attack':40B,77C,89C 'authent':4A,37B,53C 'caus':46B 'conduct':83C 'critic':33B,55C 'cve':10A,13A 'denial':48B,86C 'denial-of-servic':85C 'diskstat':24B,64C 'dsm':2A,16B,66C 'expos':8A 'file':9A,44B,81C 'function':34B,56C 'host':20B 'infrastructur':17B 'limit':47B,84C 'manag':25B,65C 'miss':3A,52C 'perform':31B 'read':42B,79C 'remot':39B,76C 'requir':36B 'self':19B 'self-host':18B 'servic':50B,88C 'specif':43B,80C 'synolog':1A,21B,23B,63C 'vulner':57C 'webdav':6A,22B,28B,60C 'without':35B","nicknames":[],"mitigations":[],"who_affected":"DSM versions before 7.3.2-86009-5 and 7.4.1-90080-1 are affected. Systems that expose the WebDAV service to the network are the main concern; the sources do not say whether the flaw requires WebDAV to be enabled.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["dsm","infrastructure","medium","selfhosted","synology","webdav"],"campaign_type":null,"search_a":"'-15198':12A,15A '-2026':11A,14A 'api':7A 'authent':4A 'cve':10A,13A 'dsm':2A 'expos':8A 'file':9A 'miss':3A 'synolog':1A 'webdav':6A","search_b":"'api':29B 'attack':40B 'authent':37B 'caus':46B 'critic':33B 'denial':48B 'diskstat':24B 'dsm':16B 'file':44B 'function':34B 'host':20B 'infrastructur':17B 'limit':47B 'manag':25B 'perform':31B 'read':42B 'remot':39B 'requir':36B 'self':19B 'self-host':18B 'servic':50B 'specif':43B 'synolog':21B,23B 'webdav':22B,28B 'without':35B","search_c":"'-1':74C '-5':70C '-86009':69C '-90080':73C '7.3.2':68C '7.4.1':72C 'allow':75C 'api':61C 'attack':77C,89C 'authent':53C 'conduct':83C 'critic':55C 'denial':86C 'denial-of-servic':85C 'diskstat':64C 'dsm':66C 'file':81C 'function':56C 'limit':84C 'manag':65C 'miss':52C 'read':79C 'remot':76C 'servic':88C 'specif':80C 'synolog':63C 'vulner':57C 'webdav':60C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-12T04:17:18+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","cvss_by":"security@synology.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-15198","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15198","severity":null,"published_at":"2026-11-12T04:17:18+00:00","modified_at":"2026-11-12T04:17:18+00:00","first_seen_at":"2026-11-12T04:47:08+00:00","fetched_at":"2026-11-12T04:47:08+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"}