{"id":"CVE-2026-126387","kind":"vulnerability","aliases":["CVE-2026-126387"],"related":[],"title":"n8n: Browser Use upload tool reads arbitrary server files for members","description":"n8n before 2.46.1 contains an arbitrary file read vulnerability that allows authenticated members to read server files by supplying absolute paths to the Browser Use browser_upload tool. Attackers with a connected remote browser session can have Playwright read files such as instance configuration from the n8n server and retrieve their contents from the page.","summary":"n8n before 2.46.1 lets an authenticated member pass absolute file paths to the Browser Use browser_upload tool. Playwright then reads those files from the n8n server and returns their contents through the browser page, exposing instance configuration.","severity":"medium","cvss":6.0,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["ai-agents","ai-tooling","browser-use","n8n","self-hosted"],"not_affected_if":["auth-required","default-config"],"how_to_check":"- Check the n8n version with `n8n --version` or the instance's About page; versions below `2.46.1` are affected.\n- Check whether the Browser Use tool (AI agent with a connected remote browser) is enabled in workflows.","fix":"- n8n: move to `2.46.1` or later.","status":"open","published_at":"2026-11-13T10:17:42+00:00","first_seen_at":"2026-11-13T10:47:18+00:00","triaged_at":"2026-11-13T10:56:43+00:00","updated_at":"2026-11-13T10:56:43+00:00","category":"ai-tooling","confidence":0.7,"triage":{"at":"2026-11-13T10:56:43Z","model":"claude-haiku-5-5","output":{"fix":"- n8n: move to `2.46.1` or later.","reach":"network","title":"n8n: Browser Use upload tool reads arbitrary server files for members","impact":"medium","summary":"n8n before 2.46.1 lets an authenticated member pass absolute file paths to the Browser Use browser_upload tool. Playwright then reads those files from the n8n server and returns their contents through the browser page, exposing instance configuration.","audience":"businesses","category":"ai-tooling","nicknames":[],"who_cares":["n8n","self-hosted","ai-agents","browser-use"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"server config files readable by an authenticated member","analyst_note":"","how_to_check":"- Check the n8n version with `n8n --version` or the instance's About page; versions below `2.46.1` are affected.\n- Check whether the Browser Use tool (AI agent with a connected remote browser) is enabled in workflows.","plain_action":"","product_name":"","needs_analyst":false,"not_affected_if":["auth-required","default-config"],"who_is_affected":"Self-hosted or managed n8n instances before 2.46.1 where members can run workflows or agents that use the Browser Use browser_upload tool with a connected remote browser session. Instances without that tool or without remote browser sessions are not exposed to this path. Access requires an authenticated member account.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000726,"input_tokens":4603,"output_tokens":532,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-126387':14A,17A '-2026':13A,16A '2.46.1':33B,71C 'absolut':39B,88C 'agent':20B 'ai':19B,22B 'ai-ag':18B 'ai-tool':21B 'allow':79C 'arbitrari':7A,74C 'attack':97C 'authent':36B,80C 'browser':2A,25B,44B,46B,64B,92C,94C,102C 'browser-us':24B 'configur':68B,112C 'connect':100C 'contain':72C 'content':61B,120C 'cve':12A,15A 'expos':66B 'file':9A,40B,53B,75C,85C,108C 'host':30B 'instanc':67B,111C 'let':34B 'member':11A,37B,81C 'n8n':1A,27B,31B,56B,69C,115C 'page':65B,123C 'pass':38B 'path':41B,89C 'playwright':49B,106C 'read':6A,51B,76C,83C,107C 'remot':101C 'retriev':118C 'return':59B 'self':29B 'self-host':28B 'server':8A,57B,84C,116C 'session':103C 'suppli':87C 'tool':5A,23B,48B,96C 'upload':4A,47B,95C 'use':3A,26B,45B,93C 'vulner':77C","nicknames":[],"mitigations":[],"who_affected":"Self-hosted or managed n8n instances before 2.46.1 where members can run workflows or agents that use the Browser Use browser_upload tool with a connected remote browser session. Instances without that tool or without remote browser sessions are not exposed to this path. Access requires an authenticated member account.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["aiagents","aitooling","browseruse","medium","n8n","selfhosted"],"campaign_type":null,"search_a":"'-126387':14A,17A '-2026':13A,16A 'arbitrari':7A 'browser':2A 'cve':12A,15A 'file':9A 'member':11A 'n8n':1A 'read':6A 'server':8A 'tool':5A 'upload':4A 'use':3A","search_b":"'2.46.1':33B 'absolut':39B 'agent':20B 'ai':19B,22B 'ai-ag':18B 'ai-tool':21B 'authent':36B 'browser':25B,44B,46B,64B 'browser-us':24B 'configur':68B 'content':61B 'expos':66B 'file':40B,53B 'host':30B 'instanc':67B 'let':34B 'member':37B 'n8n':27B,31B,56B 'page':65B 'pass':38B 'path':41B 'playwright':49B 'read':51B 'return':59B 'self':29B 'self-host':28B 'server':57B 'tool':23B,48B 'upload':47B 'use':26B,45B","search_c":"'2.46.1':71C 'absolut':88C 'allow':79C 'arbitrari':74C 'attack':97C 'authent':80C 'browser':92C,94C,102C 'configur':112C 'connect':100C 'contain':72C 'content':120C 'file':75C,85C,108C 'instanc':111C 'member':81C 'n8n':69C,115C 'page':123C 'path':89C 'playwright':106C 'read':76C,83C,107C 'remot':101C 'retriev':118C 'server':84C,116C 'session':103C 'suppli':87C 'tool':96C 'upload':95C 'use':93C 'vulner':77C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-10-28T08:48:04+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-126387","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126387","severity":null,"published_at":"2026-11-13T10:17:42+00:00","modified_at":"2026-11-13T10:17:42+00:00","first_seen_at":"2026-11-13T10:47:18+00:00","fetched_at":"2026-11-13T10:47:18+00:00","note":null}],"documents":[{"id":110634,"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-9qx8-fhxv-w794","title":"Maintainer's advisory: github.com","kind":"vendor","source":"ghsa-repo","publisher":"vendor","text":null,"published_at":"2026-10-28T08:48:04+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":145017,"url":"https://www.vulncheck.com/advisories/n8n-before-2.46.1-arbitrary-file-read-via-browser-use-browser-upload-tool","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"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"}