# CVE-2026-70857: Oracle Siebel CRM End User cross-site scripting in Open UI

Source: https://junglewise.ai/threats/cve-2026-70857-oracle-siebel-crm-end-user-cross-site-scripting-in-open-ui  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-18. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-70857 · Severity: high · CVSS 7.7 · Published 2026-08-18

Oracle Siebel CRM is a customer relationship management system used to manage sales and customer interactions. A vulnerability in the Open UI component allows an authenticated attacker with user interaction to compromise the system, resulting in unauthorized access to or modification of customer data and business records.

Technologies: [Oracle Siebel CRM](https://junglewise.ai/threats/technologies/siebel-crm), [Oracle Siebel CRM End User](https://junglewise.ai/threats/technologies/siebel-crm-end-user). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-70857 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-70857 being exploited in the wild.

**How severe is CVE-2026-70857?** High severity, with a CVSS score of 7.7, published 18 August 2026.

**Which products and versions are affected?** Oracle Siebel CRM End User 17.0 through 26.6.

**Is there a fix for CVE-2026-70857?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-70857 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-70857?** Check whether you run Oracle Siebel CRM or Oracle Siebel CRM End User at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is a cross-site scripting or similar injection vulnerability in the Open UI component of Oracle Siebel CRM End User. The vulnerability requires low privilege network access via HTTPS and user interaction (such as clicking a malicious link), making it difficult to exploit directly. An attacker can achieve unauthorized creation, deletion, or modification of critical data, as well as unauthorized read access to all Siebel CRM End User accessible data. The vulnerability has scope change impact, meaning successful exploitation may significantly affect other connected products or systems. Affected versions are 17.0 through 26.6.

## Affected products

- Oracle Siebel CRM End User 17.0 through 26.6

## Timeline

- 2026-08-18: disclosed
- 2026-08-18: advisory

## References

- [https://www.oracle.com/security-alerts/cspuaug2026.html](https://www.oracle.com/security-alerts/cspuaug2026.html)

## Related threats

- [Oracle Siebel CRM Deployment privilege escalation in Server Infrastructure](https://junglewise.ai/threats/cve-2026-91446-vulnerability-in-the-siebel-crm-deployment-product-of-oracle)
- [Oracle Siebel CRM End User unauthorized data access in Communications Panel](https://junglewise.ai/threats/cve-2026-91445-vulnerability-in-the-siebel-crm-end-user-product-of-oracle-siebel)
- [Oracle Siebel CRM End User unauthorized data access in Open UI](https://junglewise.ai/threats/cve-2026-91432-vulnerability-in-the-siebel-crm-end-user-product-of-oracle-siebel)
- [Oracle Siebel CRM End User unauthorized data access in Open UI](https://junglewise.ai/threats/cve-2026-91431-vulnerability-in-the-siebel-crm-end-user-product-of-oracle-siebel)
- [Oracle Siebel CRM Financial Accounts unauthorized data access](https://junglewise.ai/threats/cve-2026-91430-vulnerability-in-the-siebel-apps-financial-services-product-of)