# CVE-2026-91502: Oracle WebLogic Server data modification and DoS in Core

Source: https://junglewise.ai/threats/cve-2026-91502-vulnerability-in-the-oracle-weblogic-server-product-of-oracle  
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-2026-91502 · Severity: high · CVSS 7.3 · Published 2026-10-20

Oracle WebLogic Server, a Java application server used to deploy enterprise applications, contains a vulnerability in its Core component that allows unauthenticated attackers to compromise the server over the network. Successful exploitation could result in unauthorized access to sensitive data, modification of data, and temporary service disruption without requiring authentication or user interaction.

Technologies: [Oracle WebLogic Server](https://junglewise.ai/threats/technologies/weblogic-server). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-91502 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91502 being exploited in the wild.

**How severe is CVE-2026-91502?** High severity, with a CVSS score of 7.3, published 20 October 2026.

**Which products and versions are affected?** Oracle WebLogic Server 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 15.1.1.0.0.

**Is there a fix for CVE-2026-91502?** 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-2026-91502 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-91502?** Check whether you run Oracle WebLogic Server 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 exists in the Core component of Oracle WebLogic Server accessible via TLS over the network. The flaw requires no authentication or user interaction and allows unauthenticated attackers to read, modify, and delete data as well as cause partial denial of service. A fix exists for the affected versions.

## Affected products

- Oracle WebLogic Server 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 15.1.1.0.0

## Timeline

- 2026-10-20: disclosed

## References

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

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