CVE-2026-91359 Oracle Corporation CVE debrief

Who should care

Defenders responsible for Oracle Siebel CRM Cloud Applications should assess exposure and potential data access risks. Operators, platform administrators, vulnerability management teams, and security teams should review the vulnerability and its potential impact on their systems. They should verify exposure, assess potential data breaches, and review security controls to prevent exploitation.

Why it matters

CVE-2026-91359 is a medium-severity vulnerability in Oracle Siebel CRM Cloud Applications that allows unauthenticated attackers to access sensitive data. Defenders should prioritize verifying exposure, assessing potential data access risks, and reviewing security controls to prevent exploitation.

• Verify Siebel CRM Cloud Applications exposure to unauthorized data access
• Assess potential data breaches due to this vulnerability
• Review and update security controls to prevent exploitation

Technical summary

CVE-2026-91359 is a medium-severity vulnerability in Oracle Siebel CRM Cloud Applications, allowing unauthenticated attackers to access sensitive data. The vulnerability has a CVSS score of 5.3 and is considered medium-severity. The affected product is Oracle Siebel CRM Cloud Applications, versions 22.3-26.9. Defenders should prioritize verifying exposure and assessing potential data access risks. The CVE record and NVD entry provide details on the vulnerability, but its scope and remediation require verification. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Siebel CRM Cloud Applications accessible data.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential data access risks.

Recommended defensive actions

• Verify Siebel CRM Cloud Applications version and exposure
• Assess potential data access risks
• Review Oracle security alerts for remediation guidance
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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 its scope and remediation require verification. The vulnerability allows unauthenticated attackers to access sensitive data. Defenders should verify exposure and assess potential data access risks. The affected product is Oracle Siebel CRM Cloud Applications, versions 22.3-26.9. The CVE record was published on 2026-10-20T22:20:38.643Z and has not been modified since then.

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.