{"id":"CVE-2018-19953","kind":"vulnerability","aliases":["CVE-2018-19953"],"related":[],"title":"QNAP Network Attached Storage (NAS): QNAP NAS File Station Cross-Site Scripting Vulnerability","description":"If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed the issue in the following QTS versions. QTS 4.4.2.1231 on build 20200302; QTS 4.4.1.1201 on build 20200130; QTS 4.3.6.1218 on build 20200214; QTS 4.3.4.1190 on build 20200107; QTS 4.3.3.1161 on build 20200109; QTS 4.2.6 on build 20200109.","summary":"QNAP NAS File Station has a cross-site scripting flaw that lets a remote attacker inject malicious script. The sources say it is exploited in the wild and tagged for ransomware use, so an attacker can run script in a logged-in user's browser session on the NAS.","severity":"medium","cvss":6.1,"epss":0.30527,"exploited":true,"exploited_at":"2022-05-24T00:00:00+00:00","products":[{"name":"QNAP Network Attached Storage (NAS)","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","file-station","infrastructure","nas","qnap","ransomware","self-hosted"],"not_affected_if":["file-station-not-used","no-qnap-nas"],"how_to_check":null,"fix":"Apply the QNAP firmware update per the vendor instructions named in the CISA KEV entry; the specific fixed version is unknown from these sources.","status":"open","published_at":"2020-10-28T18:15:12+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:15:56+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-10-23T21:15:56Z","model":"claude-haiku-5-5","output":{"fix":"Apply the QNAP firmware update per the vendor instructions named in the CISA KEV entry; the specific fixed version is unknown from these sources.\nunknown","reach":"network","impact":"medium","summary":"QNAP NAS File Station has a cross-site scripting flaw that lets a remote attacker inject malicious script. The sources say it is exploited in the wild and tagged for ransomware use, so an attacker can run script in a logged-in user's browser session on the NAS.","category":"infrastructure","who_cares":["qnap","nas","self-hosted","file-station"],"confidence":0.5,"needs_auth":"unknown","worst_case":"Attacker runs script in admin's browser session on the NAS","analyst_note":"Find the QNAP advisory for CVE-2018-19953 to get affected and fixed firmware versions and the File Station trigger, starting from the CISA KEV entry.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["no-qnap-nas","file-station-not-used"],"user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000483,"input_tokens":2846,"output_tokens":396,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-19953':17A,20A '-2018':16A,19A '20200107':134C '20200109':139C,144C '20200130':124C '20200214':129C '20200302':119C '4.2.6':141C '4.3.3.1161':136C '4.3.4.1190':131C '4.3.6.1218':126C '4.4.1.1201':121C '4.4.2.1231':116C 'allow':97C 'alreadi':106C 'attach':3A 'attached':23A 'attack':52B,72B,99C 'browser':83B 'build':118C,123C,128C,133C,138C,143C 'code':103C 'could':96C 'cross':11A,44B,92C 'cross-sit':10A,43B,91C 'cve':15A,18A 'exploit':26B,61B,89C 'file':8A,28B,39B 'file-st':27B 'fix':107C 'flaw':47B 'follow':112C 'host':36B 'infrastructur':30B 'inject':53B,101C 'issu':109C 'let':49B 'log':79B 'logged-in':78B 'malici':54B,102C 'nas':5A,7A,25A,31B,38B,87B 'network':2A,22A 'qnap':1A,6A,21A,32B,37B,104C 'qts':113C,115C,120C,125C,130C,135C,140C 'ransomwar':33B,68B 'remot':51B,98C 'run':74B 'say':58B 'script':13A,46B,55B,75B,94C 'self':35B 'self-host':34B 'session':84B 'site':12A,45B,93C 'sourc':57B 'station':9A,29B,40B 'storag':4A 'storage':24A 'tag':66B 'use':69B 'user':81B 'version':114C 'vulner':14A,95C 'wild':64B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2020-10-28T18:15:12+00:00","kev":{"dateAdded":"2022-05-24","dueDate":"2022-06-14","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2018-19953","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-19953","severity":null,"published_at":"2022-05-24T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T17:39:57+00:00","note":null},{"source":"epss","external_id":"CVE-2018-19953","url":"https://api.first.org/data/v1/epss?cve=CVE-2018-19953","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:45+00:00","fetched_at":"2026-10-23T19:13:45+00:00","note":null},{"source":"nvd","external_id":"CVE-2018-19953","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-19953","severity":null,"published_at":"2020-10-28T18:15:12+00:00","modified_at":"2026-10-01T20:17:17+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}