{"id":"CVE-2026-17339","kind":"vulnerability","aliases":["CVE-2026-17339"],"related":[],"title":"IBM API Connect V12 OnPrem: logged-in user can reach other tenants' resources via path traversal (fixed in 12.1.1.3)","description":"IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to access or delete resources belonging to other tenants due to path traversal.","summary":"IBM API Connect versions 12.1.0.0 through 12.1.1.2 contain a path traversal flaw that lets a remote, logged-in user reach resources belonging to other tenants. An attacker can access or delete those resources.","severity":"critical","cvss":9.1,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"API Connect V12 OnPrem","fixed":["12.1.1.3"],"affected":">= 12.1.0.0, <= 12.1.1.2","ecosystem":"vendor"}],"ecosystems":[],"tags":["api-gateway","ibm-api-connect","infrastructure","multi-tenant","self-hosted"],"not_affected_if":["unknown","v12.1.1.3-or-later"],"how_to_check":"Check your API Connect V12 OnPrem version; versions v12.1.0.0 through v12.1.1.2 are affected. v12.1.1.3 contains the fix. Only IBM's V12 OnPrem is listed; if you run another API Connect offering, check IBM's bulletin or ask IBM support.","fix":"Upgrade IBM API Connect V12 OnPrem to v12.1.1.3 (Fix Central: https://www.ibm.com/support/pages/node/7290205)","status":"open","published_at":"2026-11-07T05:18:45+00:00","first_seen_at":"2026-11-07T05:46:04+00:00","triaged_at":"2026-11-07T05:48:39+00:00","updated_at":"2026-11-07T05:54:06+00:00","category":"infrastructure","confidence":0.9,"triage":{"at":"2026-11-07T05:48:39Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"IBM API Connect: authenticated path traversal reaches other tenants' resources","impact":"high","summary":"IBM API Connect versions 12.1.0.0 through 12.1.1.2 contain a path traversal flaw that lets a remote, logged-in user reach resources belonging to other tenants. An attacker can access or delete those resources.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["ibm-api-connect","api-gateway","multi-tenant"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"Attacker reads or deletes other tenants' API resources","analyst_note":"Find IBM's security bulletin for CVE-2026-17339 to confirm the fixed version and affected deployment conditions.","how_to_check":"- Check the installed API Connect version against the affected range `12.1.0.0` through `12.1.1.2`\n- unknown for other checks: the sources do not say","plain_action":"","needs_analyst":true,"not_affected_if":["unknown"],"who_is_affected":"Organizations running IBM API Connect 12.1.0.0 through 12.1.1.2 with multiple tenants. The sources do not describe which deployment configurations are exposed beyond the authenticated remote requirement.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000669,"input_tokens":4196,"output_tokens":499,"severity_before":"critical"},"analyst_status":"done","analyst_note":"Find IBM's security bulletin for CVE-2026-17339 to confirm the fixed version and affected deployment conditions.","search":"'-17339':23A,26A '-2026':22A,25A '12.1.0.0':49B,82C '12.1.1.2':51B,84C '12.1.1.3':20A 'access':74B,92C 'allow':86C 'api':2A,27A,32B,36B,46B,80C 'api-gateway':31B 'attack':72B,90C 'authent':89C 'belong':67B,96C 'connect':3A,28A,37B,47B,81C 'contain':52B 'could':85C 'cve':21A,24A 'delet':76B,94C 'due':100C 'fix':18A 'flaw':56B 'gateway':33B 'host':44B 'ibm':1A,35B,45B,79C 'ibm-api-connect':34B 'infrastructur':38B 'let':58B 'log':7A,62B 'logged-in':6A,61B 'multi':40B 'multi-ten':39B 'onprem':5A,30A 'path':16A,54B,102C 'reach':11A,65B 'remot':60B,88C 'resourc':14A,66B,78B,95C 'self':43B 'self-host':42B 'tenant':13A,41B,70B,99C 'travers':17A,55B,103C 'user':9A,64B 'v12':4A,29A 'version':48B 'via':15A","nicknames":[],"mitigations":[],"who_affected":"Teams running self-managed (OnPrem) IBM API Connect V12, versions v12.1.0.0 to v12.1.1.2, where a logged-in user (low privileges) can send requests. A path traversal lets that user access or delete other tenants' resources, so multi-tenant setups are the main concern. IBM lists no workaround. Teams on other versions or other API Connect offerings not named in the bulletin can skip it.","tier":"B","verified":{"fix":{"at":"2026-11-07T05:54:06Z","by":"analyst","doc":"https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39","run_id":1975},"products":{"at":"2026-11-07T05:54:06Z","by":"analyst","doc":"https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39","run_id":1975},"workarounds":{"at":"2026-11-07T05:54:06Z","by":"analyst","doc":"https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39","run_id":1975},"how_to_check":{"at":"2026-11-07T05:54:06Z","by":"analyst","doc":"https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39","run_id":1975},"who_affected":{"at":"2026-11-07T05:54:06Z","by":"analyst","doc":"https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39","run_id":1975}},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":["apiconnectv12onprem","connectv12onprem"],"ptokens":["api","connect","onprem","v12"],"labels":["apigateway","critical","ibmapiconnect","infrastructure","multitenant","selfhosted"],"campaign_type":null,"search_a":"'-17339':23A,26A '-2026':22A,25A '12.1.1.3':20A 'api':2A,27A 'connect':3A,28A 'cve':21A,24A 'fix':18A 'ibm':1A 'log':7A 'logged-in':6A 'onprem':5A,30A 'path':16A 'reach':11A 'resourc':14A 'tenant':13A 'travers':17A 'user':9A 'v12':4A,29A 'via':15A","search_b":"'12.1.0.0':49B '12.1.1.2':51B 'access':74B 'api':32B,36B,46B 'api-gateway':31B 'attack':72B 'belong':67B 'connect':37B,47B 'contain':52B 'delet':76B 'flaw':56B 'gateway':33B 'host':44B 'ibm':35B,45B 'ibm-api-connect':34B 'infrastructur':38B 'let':58B 'log':62B 'logged-in':61B 'multi':40B 'multi-ten':39B 'path':54B 'reach':65B 'remot':60B 'resourc':66B,78B 'self':43B 'self-host':42B 'tenant':41B,70B 'travers':55B 'user':64B 'version':48B","search_c":"'12.1.0.0':82C '12.1.1.2':84C 'access':92C 'allow':86C 'api':80C 'attack':90C 'authent':89C 'belong':96C 'connect':81C 'could':85C 'delet':94C 'due':100C 'ibm':79C 'path':102C 'remot':88C 'resourc':95C 'tenant':99C 'travers':103C","first_public_at":"2026-11-07T05:18:45+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:L","cvss_by":"psirt@us.ibm.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-17339","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-17339","severity":null,"published_at":"2026-11-07T05:18:45+00:00","modified_at":"2026-11-07T05:18:45+00:00","first_seen_at":"2026-11-07T05:46:04+00:00","fetched_at":"2026-11-07T05:46:04+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-17339:1975","url":"https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39","severity":null,"published_at":"2026-11-07T05:54:06+00:00","modified_at":"2026-11-07T05:54:06+00:00","first_seen_at":"2026-11-07T05:54:06+00:00","fetched_at":"2026-11-07T05:54:06+00:00","note":"IBM bulletin (multiple-vulnerabilities-ibm-api-connect-39, 2026-11-05): affected V12 OnPrem v12.1.0.0-v12.1.1.2, fix v12.1.1.3, workarounds none. Not exploited per sources; no PoC found.","cites":["https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39"]}],"documents":[{"id":93149,"url":"https://www.ibm.com/support/pages/security-bulletin-multiple-vulnerabilities-ibm-api-connect-39","title":"IBM Security Bulletin: Multiple Vulnerabilities in IBM API Connect (v12.1.1.3)","kind":"advisory","source":"analyst","publisher":null,"text":null,"published_at":null,"relation":"advisory","confidence":null,"note":null}],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}