{"id":"CVE-2026-17488","kind":"vulnerability","aliases":["CVE-2026-17488"],"related":[],"title":"IBM i: authenticated remote user can bypass security restrictions","description":"IBM i 7.3, 7.4, 7.5, and 7.6 could allow a remote authenticated attacker to bypass security restrictions due to improper authentication.","summary":"IBM i versions 7.3 through 7.6 have an improper authentication flaw. A remote attacker who already holds valid credentials can bypass security restrictions.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"ibm i","fixed":[],"affected":"= 7.3","ecosystem":"vendor"},{"name":"ibm i","fixed":[],"affected":"= 7.4","ecosystem":"vendor"},{"name":"ibm i","fixed":[],"affected":"= 7.5","ecosystem":"vendor"},{"name":"ibm i","fixed":[],"affected":"= 7.6","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["as400","ibm-i","infrastructure","self-hosted"],"not_affected_if":["no-remote-authenticated-users"],"how_to_check":"- Check the installed IBM i release with `DSPPTF` or `GO LICPGM` on the IBM i partition and compare it to the fixed levels in IBM's bulletin\n- unknown whether the sources list the affected PTF group numbers","fix":"- Apply the IBM i PTF or group PTF that IBM published for this CVE; the sources do not name the exact PTF, so the version to move to is unknown\n- Review IBM's security bulletin for the CVE to confirm the fixed level","status":"open","published_at":"2026-10-16T19:17:06+00:00","first_seen_at":"2026-10-23T21:57:14+00:00","triaged_at":"2026-10-25T03:57:47+00:00","updated_at":"2026-10-25T03:57:47+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-10-25T03:57:47Z","model":"claude-haiku-5-5","output":{"fix":"- Apply the IBM i PTF or group PTF that IBM published for this CVE; the sources do not name the exact PTF, so the version to move to is unknown\n- Review IBM's security bulletin for the CVE to confirm the fixed level","reach":"network","title":"IBM i: authenticated remote user can bypass security restrictions","impact":"medium","summary":"IBM i versions 7.3 through 7.6 have an improper authentication flaw. A remote attacker who already holds valid credentials can bypass security restrictions.","category":"infrastructure","nicknames":[],"who_cares":["ibm-i","as400","self-hosted"],"confidence":0.5,"needs_auth":"yes","worst_case":"authenticated remote user bypasses access restrictions on the system","analyst_note":"Find IBM's security bulletin for CVE-2026-17488 to get the exact PTF numbers and the affected component.","how_to_check":"- Check the installed IBM i release with `DSPPTF` or `GO LICPGM` on the IBM i partition and compare it to the fixed levels in IBM's bulletin\n- unknown whether the sources list the affected PTF group numbers","needs_analyst":true,"not_affected_if":["no-remote-authenticated-users"],"who_is_affected":"IBM i 7.3, 7.4, 7.5 and 7.6 systems are affected, and the attacker must already have a valid user on the system. Teams running IBM i partitions that accept remote logins (for example through network services or ODBC/JDBC access) should look at this first. The sources do not describe a specific configuration, so systems without remote user access are unlikely to be exposed.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000638,"input_tokens":3371,"output_tokens":602,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-17488':12A,15A '-2026':11A,14A '7.3':35B,57C '7.4':58C '7.5':59C '7.6':37B,61C 'allow':63C 'alreadi':47B 'as400':24B 'attack':45B,67C 'authent':3A,41B,66C,75C 'bypass':7A,52B,69C 'could':62C 'credenti':50B 'cve':10A,13A 'due':72C 'flaw':42B 'hold':48B 'host':31B 'i':17A,19A,21A,23A 'ibm':1A,16A,18A,20A,22A,26B,32B,55C 'ibm-i':25B 'improp':40B,74C 'infrastructur':28B 'remot':4A,44B,65C 'restrict':9A,54B,71C 'secur':8A,53B,70C 'self':30B 'self-host':29B 'user':5A 'valid':49B 'version':34B","nicknames":[],"mitigations":[],"who_affected":"IBM i 7.3, 7.4, 7.5 and 7.6 systems are affected, and the attacker must already have a valid user on the system. Teams running IBM i partitions that accept remote logins (for example through network services or ODBC/JDBC access) should look at this first. The sources do not describe a specific configuration, so systems without remote user access are unlikely to be exposed.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T19:17:06+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cvss_by":"psirt@us.ibm.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-17488","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-17488","severity":null,"published_at":"2026-10-16T19:17:06+00:00","modified_at":"2026-10-23T15:46:32+00:00","first_seen_at":"2026-10-23T21:57:14+00:00","fetched_at":"2026-10-23T22:28:55+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"}