{"id":"CVE-2026-17303","kind":"vulnerability","aliases":["CVE-2026-17303"],"related":[],"title":"IBM API Connect: authenticated users can reach internal systems via URL","description":"IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to access internal network resources due to improper validation of a user-supplied URL. The address is not sufficiently restricted, which could allow the server to contact internal systems.","summary":"IBM API Connect does not sufficiently restrict a user-supplied URL, so the server can be made to contact internal systems. A remote attacker with a valid account can use the server to reach internal network resources.","severity":"medium","cvss":6.4,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["ibm-api-connect","self-hosted","vendor"],"not_affected_if":["version-outside-range"],"how_to_check":"- Confirm the installed API Connect version with the product's admin console or installation records, and compare it to the affected ranges `10.0.8.0` through `10.0.8.12` and `12.1.0.0` through `12.1.1.2`","fix":null,"status":"open","published_at":"2026-11-07T05:18:38+00:00","first_seen_at":"2026-11-07T05:46:02+00:00","triaged_at":"2026-11-07T05:52:42+00:00","updated_at":"2026-11-07T05:52:42+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-11-07T05:52:42Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"IBM API Connect: authenticated users can reach internal systems via URL","impact":"medium","summary":"IBM API Connect does not sufficiently restrict a user-supplied URL, so the server can be made to contact internal systems. A remote attacker with a valid account can use the server to reach internal network resources.","audience":"businesses","category":"vendor","nicknames":[],"who_cares":["ibm-api-connect","self-hosted"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"Server contacts internal systems, exposing internal network resources to the attacker","analyst_note":"Fixed version and affected feature not stated in sources; check the IBM security bulletin for CVE-2026-17303 for the fix and the vulnerable URL-handling feature.","how_to_check":"- Confirm the installed API Connect version with the product's admin console or installation records, and compare it to the affected ranges `10.0.8.0` through `10.0.8.12` and `12.1.0.0` through `12.1.1.2`\n- unknown for other checks: the sources do not say which configuration or feature exposes the URL input","plain_action":"","needs_analyst":true,"not_affected_if":["version-outside-range"],"who_is_affected":"Organisations running IBM API Connect in the affected version ranges, where authenticated users can supply a URL the server then fetches. The sources do not say which features accept a URL, so whether a given deployment is exposed is unknown. Teams on versions outside the listed ranges are not affected.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000712,"input_tokens":4257,"output_tokens":573,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-17303':14A,17A '-2026':13A,16A '10.0.8.0':67C '10.0.8.12':69C '12.1.0.0':71C '12.1.1.2':73C 'access':81C 'account':54B 'address':96C 'allow':75C,103C 'api':2A,20B,27B,65C 'attack':50B,79C 'authent':4A,78C 'connect':3A,21B,28B,66C 'contact':45B,107C 'could':74C,102C 'cve':12A,15A 'due':85C 'host':24B 'ibm':1A,19B,26B,64C 'ibm-api-connect':18B 'improp':87C 'intern':8A,46B,61B,82C,108C 'made':43B 'network':62B,83C 'reach':7A,60B 'remot':49B,77C 'resourc':63B,84C 'restrict':32B,100C 'self':23B 'self-host':22B 'server':40B,58B,105C 'suffici':31B,99C 'suppli':36B,93C 'system':9A,47B,109C 'url':11A,37B,94C 'use':56B 'user':5A,35B,92C 'user-suppli':34B,91C 'valid':53B,88C 'vendor':25B 'via':10A","nicknames":[],"mitigations":[],"who_affected":"Organisations running IBM API Connect in the affected version ranges, where authenticated users can supply a URL the server then fetches. The sources do not say which features accept a URL, so whether a given deployment is exposed is unknown. Teams on versions outside the listed ranges are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["ibmapiconnect","medium","selfhosted","vendor"],"campaign_type":null,"search_a":"'-17303':14A,17A '-2026':13A,16A 'api':2A 'authent':4A 'connect':3A 'cve':12A,15A 'ibm':1A 'intern':8A 'reach':7A 'system':9A 'url':11A 'user':5A 'via':10A","search_b":"'account':54B 'api':20B,27B 'attack':50B 'connect':21B,28B 'contact':45B 'host':24B 'ibm':19B,26B 'ibm-api-connect':18B 'intern':46B,61B 'made':43B 'network':62B 'reach':60B 'remot':49B 'resourc':63B 'restrict':32B 'self':23B 'self-host':22B 'server':40B,58B 'suffici':31B 'suppli':36B 'system':47B 'url':37B 'use':56B 'user':35B 'user-suppli':34B 'valid':53B 'vendor':25B","search_c":"'10.0.8.0':67C '10.0.8.12':69C '12.1.0.0':71C '12.1.1.2':73C 'access':81C 'address':96C 'allow':75C,103C 'api':65C 'attack':79C 'authent':78C 'connect':66C 'contact':107C 'could':74C,102C 'due':85C 'ibm':64C 'improp':87C 'intern':82C,108C 'network':83C 'remot':77C 'resourc':84C 'restrict':100C 'server':105C 'suffici':99C 'suppli':93C 'system':109C 'url':94C 'user':92C 'user-suppli':91C 'valid':88C","first_public_at":"2026-11-07T05:18:38+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","cvss_by":"psirt@us.ibm.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-17303","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-17303","severity":null,"published_at":"2026-11-07T05:18:38+00:00","modified_at":"2026-11-07T05:18:38+00:00","first_seen_at":"2026-11-07T05:46:02+00:00","fetched_at":"2026-11-07T05:46:02+00:00","note":null}],"documents":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}