CVE-2026-91338 Oracle Corporation CVE debrief

Who should care

Defenders responsible for Oracle E-Business Suite and iSupport products should assess exposure and prioritize remediation due to potential data integrity and confidentiality impacts. This includes IT security teams, system administrators, and compliance officers.

Why it matters

CVE-2026-91338 is a high-severity vulnerability in Oracle E-Business Suite's iSupport product, allowing low-privileged attackers to compromise data integrity and confidentiality. Defenders should assess exposure, prioritize patching, and monitor for suspicious activity due to potential data impacts.

• Potential unauthorized data modifications
• Potential data confidentiality breaches
• Need for patch verification and prioritization
• Importance of monitoring for suspicious activity

Technical summary

CVE-2026-91338 is a high-severity vulnerability in the iSupport product of Oracle E-Business Suite, affecting versions 12.2.3-12.2.15. The vulnerability allows a low-privileged attacker with network access via HTTP to compromise iSupport, potentially resulting in unauthorized creation, deletion, or modification access to critical data or all iSupport accessible data, as well as unauthorized read access to a subset of iSupport accessible data. The CVSS 3.1 Base Score is 7.1, indicating high severity.

Defensive priority

Defenders should prioritize verifying exposure and applying patches due to potential data integrity and confidentiality impacts.

Recommended defensive actions

• Verify exposure of iSupport product versions 12.2.3-12.2.15
• Assess network access and HTTP exposure
• Prioritize patching based on CVSS score of 7.1
• Monitor for unauthorized data modifications
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions and remediation is limited. The iSupport product versions 12.2.3-12.2.15 are affected, and defenders should verify exposure and apply patches. The CVE record was published on 2026-10-20T22:20:36.123Z and has not been modified since then. The official CVE Program record and NVD detail page provide source-provided CVE metadata and source-specific vulnerability assessment. However, additional information on remediation and

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.