{"id":"CVE-2026-16720","published":"2026-11-07T05:18:21.883","lastModified":"2026-11-10T16:56:41.287","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 attacker to obtain valid access tokens for other users due to improper authentication. Authentication against a connected directory service is not sufficiently enforced, which could allow another user's identity to be assumed.","cvssScore":9.8,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-287"],"vendors":["ibm"],"products":["api connect"],"references":[{"url":"https://www.ibm.com/support/pages/node/7295635","tags":["Vendor Advisory"]},{"url":"https://www.ibm.com/support/pages/node/7295637","tags":["Vendor Advisory"]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"IBM API Connect fails to properly enforce authentication when integrating with external directory services, allowing an unauthenticated remote attacker to obtain valid access tokens for other users by impersonating them.","exploitability":"Exploitation requires no prior access or user interaction and is straightforward if the attacker can send authenticated requests to the token endpoint without proper identity binding to the directory service.","blast_radius":"Successful exploitation enables full compromise of confidentiality, integrity, and availability for all API consumers relying on API Connect's authentication, potentially affecting thousands of users and backend systems.","remediation":"Upgrade IBM API Connect to version 10.0.8.13 or later for the 10.0.8.x branch, or to 12.1.1.3 or later for the 12.1.x branch.","detection":"Monitor for repeated token requests from the same source IP with varying or suspicious subject identifiers (e.g., non-existent usernames) in SAML or OAuth token responses; look for anomalous patterns in directory service bind attempts that lack proper credential validation.","tags":["auth-bypass","token-theft","oauth","saml","api-gateway"],"model":"garnet-coder","analyzedAt":"2026-11-07T09:56:09.092Z"}}