Oracle Hyperion Calculation Manager EUVD-2026-61357

The CVSS vector confirms PR:N - no credentials or authenticated session are required to attempt exploitation. The attack is delivered over HTTP (AV:N), requiring only network connectivity to the Hyperion Calculation Manager service. The critical limiting factor is AC:H: exploitation is 'difficult' per Oracle's characterization, meaning specific conditions beyond the attacker's direct control must align - this may include particular server state, request sequencing, race conditions, or environment-specific configuration. No user interaction is required (UI:N). The specific technical condition that makes the attack 'difficult' is not documented in the available data - this is unconfirmed and should be verified with Oracle's advisory details. Exploitation is limited to version 11.2.25.0.000; deployments on other versions are not confirmed affected.

The CVSS 3.1 score of 8.1 with vector AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H represents a high-severity, network-exploitable vulnerability with no authentication requirement, but the AC:H metric is a meaningful risk moderator - it indicates that exploitation is not trivially reliable and likely requires meeting race conditions, specific server state, or environmental prerequisites. No EPSS score was provided in the input data, making probabilistic exploitation likelihood estimates unavailable. The vulnerability is not confirmed in the CISA KEV catalog and no POC is publicly identified, further reducing near-term exploitation likelihood. However, the 'takeover' impact level - full CIA compromise - means even a low-frequency exploitation attempt that succeeds is catastrophic. The discrepancy between the 'Information Disclosure' tag and the C:H/I:H/A:H impact vector should be flagged: the tag may reflect only partial impact characterization by the reporter, while the official CVSS vector reflects the full risk per Oracle. Organizations running Oracle Hyperion Calculation Manager 11.2.25.0.000 in internet-exposed or multi-tenant environments should treat this as a priority item despite AC:H.

An unauthenticated attacker with network access to the Oracle Hyperion Calculation Manager HTTP interface sends a specially crafted HTTP request targeting the Security component under conditions that satisfy the high-complexity exploitation requirements - such as a specific server state, timing window, or parameter combination. If successful, the attacker achieves full control of the Hyperion Calculation Manager instance, potentially exposing sensitive financial calculation models, manipulating business logic, or causing service disruption. No public proof-of-concept exists at time of analysis, suggesting exploitation currently requires significant attacker capability or knowledge.