# CVE-2026-101574: Oracle Helidon OIDC authentication bypass

Source: https://junglewise.ai/threats/cve-2026-101574-vulnerability-in-the-helidon-product-of-oracle-fusion-middleware  
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-2026-101574 · Severity: medium · CVSS 6.9 · Published 2026-10-20

Helidon is a framework that provides OpenID Connect (OIDC) authentication for cloud-native applications. An attacker with network access can bypass authentication controls via HTTP, potentially gaining unauthorized access to sensitive data or modifying application information if a legitimate user is tricked into interaction. The vulnerability affects Helidon versions 4.0.0 through 4.5.5 and 27.0.0.

Technologies: [Oracle Helidon](https://junglewise.ai/threats/technologies/helidon). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-101574 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101574 being exploited in the wild.

**How severe is CVE-2026-101574?** Medium severity, with a CVSS score of 6.9, published 20 October 2026.

**Which products and versions are affected?** Oracle Helidon 4.0.0 through 4.5.5, 27.0.0.

**Is there a fix for CVE-2026-101574?** 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-2026-101574 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-101574?** Check whether you run Oracle Helidon 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

The vulnerability exists in the OIDC component of Oracle Helidon and can be exploited by an unauthenticated attacker with network access over HTTP. The attack is difficult to exploit and requires user interaction from someone other than the attacker, but successful exploitation results in high confidentiality impact and low integrity impact, potentially affecting other downstream products that depend on Helidon's authentication.

## Affected products

- Oracle Helidon 4.0.0 through 4.5.5, 27.0.0

## Timeline

- 2026-10-20: disclosed

## References

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

## Related threats

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- [Oracle Helidon information disclosure in helidon-webclient](https://junglewise.ai/threats/cve-2026-101586-vulnerability-in-the-helidon-product-of-oracle-fusion-middleware)
- [Oracle Helidon CORS authorization bypass in helidon-cors](https://junglewise.ai/threats/cve-2026-101585-vulnerability-in-the-helidon-product-of-oracle-fusion-middleware)