CVE-2026-83058 is a critical vulnerability in the Oracle Internet Directory product of Oracle Fusion Middleware, specifically in the OID LDAP Server component. It affects supported versions 12.2.1.4.0 and 14.1.2.1.0. The vulnerability is easily exploitable by a low privileged attacker with network access via LDAP, potentially allowing full compromise of Oracle Internet Directory. The vulnerability impacts confidentiality, integrity, and availability with a CVSS 3.1 score of 9.9. Oracle's September 2026 Critical Security Patch Update includes patches addressing this vulnerability among 673 security fixes across various Oracle products.

Successful exploitation can lead to complete takeover of Oracle Internet Directory, impacting confidentiality, integrity, and availability of the affected system. This may also affect additional products due to scope change. The vulnerability is remotely exploitable with low attack complexity and requires low privileges but no user interaction.

Oracle has released a Critical Security Patch Update in September 2026 that includes a fix for this vulnerability. Customers are strongly advised to apply the available patches promptly to mitigate the risk. Oracle recommends remaining on actively supported versions and applying security patches without delay. No alternative mitigations or workarounds are specified in the advisory.