Authentication Bypass Vulnerability in Oracle Java SE and GraalVM Products
CVE-2026-91463

5.3MEDIUM

Key Information:

Vendor

Oracle
Status
Oracle Java Se
Oracle Graalvm For Jdk
Oracle Graalvm Enterprise Edition
Vendor
CVE Published:
20 October 2026

What is CVE-2026-91463?

A vulnerability in Oracle Java SE and GraalVM products allows an unauthenticated attacker with network access to potentially compromise the security of these systems. The exploit leverages existing Java deployment configurations that load untrusted code, especially in environments utilizing sandboxed Java Web Start applications or applets. While attacks require human interaction from a different entity, the successful exploitation of this vulnerability poses a significant risk, enabling unauthorized access to sensitive data within affected Oracle products.

Affected Version(s)

Oracle GraalVM Enterprise Edition 21.3.19.1.1

Oracle GraalVM for JDK 17.0.20.1

Oracle GraalVM for JDK 21.0.12.1

References

https://www.oracle.com/security-alerts/cpuoct2026.html
vendor-advisory

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.