{"id":"CVE-2026-16709","kind":"vulnerability","aliases":["CVE-2026-16709"],"related":[],"title":"IBM API Connect: stored XSS lets a logged-in user run scripts in others' browsers","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 execute arbitrary JavaScript in the victim's browser due to cross-site scripting. User-supplied input is not properly neutralized when a web page is updated, so script content could run in another user's session.","summary":"IBM API Connect versions 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 do not neutralize user input when a web page is updated. An authenticated attacker can get script content to run in another user's browser session.","severity":"high","cvss":8.7,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"API Connect","fixed":["10.0.8.13"],"affected":">= 10.0.8.0, <= 10.0.8.12","ecosystem":"vendor"},{"name":"API Connect","fixed":["12.1.1.3"],"affected":">= 12.1.0.0, <= 12.1.1.2","ecosystem":"vendor"}],"ecosystems":[],"tags":["api-connect","ibm","infrastructure","self-hosted"],"not_affected_if":["auth-required","version-outside-range"],"how_to_check":"Find your API Connect version (management/Cloud Manager console or your deployment's installed version). Exposed if it is 10.0.8.0-10.0.8.12 or 12.1.0.0-12.1.1.2. Fixed in 10.0.8.13 and 12.1.1.3.","fix":"Upgrade API Connect 10.0.8.x to 10.0.8.13, and 12.1.x to v12.1.1.3 (IBM bulletins). IBM lists no workaround for the 10.0.8 branch.","status":"open","published_at":"2026-11-07T05:18:19+00:00","first_seen_at":"2026-11-07T05:45:57+00:00","triaged_at":"2026-11-07T05:48:51+00:00","updated_at":"2026-11-07T06:27:22+00:00","category":"infrastructure","confidence":0.85,"triage":{"at":"2026-11-07T05:48:51Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"network","title":"IBM API Connect: stored XSS lets a logged-in user run scripts in others' browsers","impact":"medium","summary":"IBM API Connect versions 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 do not neutralize user input when a web page is updated. An authenticated attacker can get script content to run in another user's browser session.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["ibm","api-connect","self-hosted"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"Scripts run in other users' sessions, exposing their session data","analyst_note":"Check the IBM security bulletin for this CVE to confirm the fixed version and the affected pages or features.","how_to_check":"- Check the installed API Connect version in the management console or product documentation, and compare it with the affected ranges\n- unknown","plain_action":"","needs_analyst":true,"not_affected_if":["version-outside-range","auth-required"],"who_is_affected":"Organizations running IBM API Connect in the affected version ranges. The attacker needs a valid account on the platform, and the flaw reaches other users who view the modified page, so exposure depends on how many users share the same instance. The sources do not say which features or pages are involved.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000682,"input_tokens":4269,"output_tokens":510,"severity_before":"high"},"analyst_status":"done","analyst_note":"Check the IBM security bulletin for this CVE to confirm the fixed version and the affected pages or features.","search":"'-16709':19A,22A '-2026':18A,21A '10.0.8.0':39B,75C '10.0.8.12':41B,77C '12.1.0.0':43B,79C '12.1.1.2':45B,81C 'allow':83C 'anoth':67B,123C 'api':2A,23A,25A,28B,36B,73C 'api-connect':27B 'arbitrari':90C 'attack':59B,87C 'authent':58B,86C 'browser':16A,70B,96C 'connect':3A,24A,26A,29B,37B,74C 'content':63B,119C 'could':82C,120C 'cross':100C 'cross-sit':99C 'cve':17A,20A 'due':97C 'execut':89C 'get':61B 'host':34B 'ibm':1A,30B,35B,72C 'infrastructur':31B 'input':50B,106C 'javascript':91C 'let':6A 'log':9A 'logged-in':8A 'neutral':48B,110C 'other':15A 'page':54B,114C 'proper':109C 'remot':85C 'run':12A,65B,121C 'script':13A,62B,102C,118C 'self':33B 'self-host':32B 'session':71B,126C 'site':101C 'store':4A 'suppli':105C 'updat':56B,116C 'user':11A,49B,68B,104C,124C 'user-suppli':103C 'version':38B 'victim':94C 'web':53B,113C 'xss':5A","nicknames":[],"mitigations":[],"who_affected":"Teams running self-hosted IBM API Connect 10.0.8.0 through 10.0.8.12 or 12.1.0.0 through 12.1.1.2. An attacker needs a valid account, and a second user must view the page the attacker modified, so shared multi-user instances are the main concern. IBM's text does not name the page or feature. Instances already on 10.0.8.13 or 12.1.1.3 can skip it.","tier":"B","verified":{"fix":{"at":"2026-11-07T06:27:22Z","by":"analyst","doc":"https://www.ibm.com/support/pages/node/7295635","run_id":2079}},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":["apiconnect","connect"],"ptokens":["api","connect"],"labels":["apiconnect","high","ibm","infrastructure","selfhosted"],"campaign_type":null,"search_a":"'-16709':19A,22A '-2026':18A,21A 'api':2A,23A,25A 'browser':16A 'connect':3A,24A,26A 'cve':17A,20A 'ibm':1A 'let':6A 'log':9A 'logged-in':8A 'other':15A 'run':12A 'script':13A 'store':4A 'user':11A 'xss':5A","search_b":"'10.0.8.0':39B '10.0.8.12':41B '12.1.0.0':43B '12.1.1.2':45B 'anoth':67B 'api':28B,36B 'api-connect':27B 'attack':59B 'authent':58B 'browser':70B 'connect':29B,37B 'content':63B 'get':61B 'host':34B 'ibm':30B,35B 'infrastructur':31B 'input':50B 'neutral':48B 'page':54B 'run':65B 'script':62B 'self':33B 'self-host':32B 'session':71B 'updat':56B 'user':49B,68B 'version':38B 'web':53B","search_c":"'10.0.8.0':75C '10.0.8.12':77C '12.1.0.0':79C '12.1.1.2':81C 'allow':83C 'anoth':123C 'api':73C 'arbitrari':90C 'attack':87C 'authent':86C 'browser':96C 'connect':74C 'content':119C 'could':82C,120C 'cross':100C 'cross-sit':99C 'due':97C 'execut':89C 'ibm':72C 'input':106C 'javascript':91C 'neutral':110C 'page':114C 'proper':109C 'remot':85C 'run':121C 'script':102C,118C 'session':126C 'site':101C 'suppli':105C 'updat':116C 'user':104C,124C 'user-suppli':103C 'victim':94C 'web':113C","first_public_at":"2026-11-07T05:18:19+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","cvss_by":"psirt@us.ibm.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-16709","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16709","severity":null,"published_at":"2026-11-07T05:18:19+00:00","modified_at":"2026-11-07T05:18:19+00:00","first_seen_at":"2026-11-07T05:45:57+00:00","fetched_at":"2026-11-07T05:45:57+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-16709:2079","url":"https://www.ibm.com/support/pages/node/7295637","severity":null,"published_at":"2026-11-07T06:27:22+00:00","modified_at":"2026-11-07T06:27:22+00:00","first_seen_at":"2026-11-07T06:27:22+00:00","fetched_at":"2026-11-07T06:27:22+00:00","note":"IBM bulletin node/7295637 lists CVE-2026-16709 (CWE-79, 8.7): affected V10.0.8.0-10.0.8.12, fix 10.0.8.13, workarounds none. Bulletin node/7295635 lists it too, fix v12.1.1.3 per its summary; its 12.1 affected-versions section was past the truncated page, so the 12.1 range comes from NVD. No exploitation or PoC found.","cites":["https://www.ibm.com/support/pages/node/7295637","https://www.ibm.com/support/pages/node/7295635"]}],"documents":[{"id":93164,"url":"https://www.ibm.com/support/pages/node/7295637","title":"IBM Security Bulletin: Multiple Vulnerabilities in IBM API Connect (10.0.8.13)","kind":"advisory","source":"analyst","publisher":null,"text":null,"published_at":null,"relation":"advisory","confidence":null,"note":null},{"id":92834,"url":"https://www.ibm.com/support/pages/node/7295635","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"}