# CVE-2026-87420: Oracle Service Bus authentication bypass in HTTP

Source: https://junglewise.ai/threats/cve-2026-87420-vulnerability-in-the-oracle-service-bus-product-of-oracle-fusion  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-87420 · Severity: high · CVSS 8.8 · Published 2026-10-20

Oracle Service Bus is middleware that routes and processes enterprise service messages. A low-privileged attacker with network access can exploit an HTTP vulnerability to take over the entire Service Bus system, compromising all data and services that pass through it.

Technologies: [Oracle Service Bus](https://junglewise.ai/threats/technologies/service-bus). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-87420 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-87420 being exploited in the wild.

**How severe is CVE-2026-87420?** High severity, with a CVSS score of 8.8, published 20 October 2026.

**Which products and versions are affected?** Oracle Service Bus 14.1.2.0.0.

**Is there a fix for CVE-2026-87420?** 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-2026-87420 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-87420?** Check whether you run Oracle Service Bus 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

An easily exploitable vulnerability in the Core component of Oracle Service Bus allows a low-privileged authenticated attacker to gain full control over the system via HTTP. The attack requires network access and low privilege credentials but no user interaction, leading to complete compromise of confidentiality, integrity, and availability.

## Affected products

- Oracle Service Bus 14.1.2.0.0

## Timeline

- 2026-10-20: disclosed

## References

- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

## Related threats

- [Oracle Service Bus remote code execution via HTTP](https://junglewise.ai/threats/cve-2026-87419-vulnerability-in-the-oracle-service-bus-product-of-oracle-fusion)
- [Oracle Service Bus denial of service in Core](https://junglewise.ai/threats/cve-2026-87369-vulnerability-in-the-oracle-service-bus-product-of-oracle-fusion)
- [Oracle Service Bus remote code execution via HTTP](https://junglewise.ai/threats/cve-2026-87364-vulnerability-in-the-oracle-service-bus-product-of-oracle-fusion)
- [Oracle Service Bus authentication bypass or privilege escalation](https://junglewise.ai/threats/cve-2026-87359-vulnerability-in-the-oracle-service-bus-product-of-oracle-fusion)