CVE-2026-9836: 
IBM InfoSphere Information Server vulnerability analysis and mitigation

CVE-2026-9836 is an information disclosure vulnerability affecting IBM InfoSphere Information Server versions 11.7.0.0 through 11.7.1.6 (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor). The vulnerability was published on June 30, 2026, with a patch made available on the same date. CVSS scores differ between sources: NVD assigns a CVSS v3.1 base score of 7.5 (High) with a network-based, unauthenticated attack vector, while the GitHub Advisory and ENISA assign a score of 3.5 (Low) reflecting an adjacent network, low-privilege attack vector (GitHub Advisory, IBM Support).

The vulnerability is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), indicating that the application improperly exposes sensitive data to actors not authorized to access it. Based on the ENISA/GitHub Advisory CVSS vector (CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N), exploitation requires the attacker to be on an adjacent network and possess low-level privileges, with no user interaction needed. The specific mechanism of disclosure (e.g., API endpoint, log exposure, or memory leak) has not been publicly detailed in available sources (GitHub Advisory, IBM Support).

Successful exploitation allows an authenticated attacker with low privileges on an adjacent network to access sensitive information stored within IBM InfoSphere Information Server. The impact is limited to confidentiality — there is no integrity or availability impact. Given that InfoSphere Information Server is a data integration and governance platform that may handle sensitive enterprise data, unauthorized information disclosure could expose metadata, configuration details, or other sensitive application data (GitHub Advisory, IBM Support).

There is no known public proof-of-concept exploit and no evidence of active in-the-wild exploitation at this time. The EPSS score is approximately 0.15–0.24%, indicating a low probability of exploitation within the next 30 days. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, and NVD's SSVC assessment classifies exploitation as "none" and automation as "no" (GitHub Advisory).

IBM has released a patch addressing this vulnerability; users should update IBM InfoSphere Information Server to a version beyond 11.7.1.6 as soon as possible. As interim mitigations, organizations should restrict network access to the InfoSphere Information Server to trusted internal networks only and implement network segmentation to limit adjacent network exposure. Enforcing the principle of least privilege for user accounts accessing the platform can further reduce risk (IBM Support).