Unauth JGSS Exploit in Oracle Java SE 8u503-11.0.32.1 (GraalVM)
CVE-2026-91462 Published on October 20, 2026
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JGSS). Supported versions that are affected are Oracle Java SE: 8u503, 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27; Oracle GraalVM for JDK: 17.0.20.1 and 21.0.12.1; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability can only be exploited by supplying data to APIs in the specified Component without using Untrusted Java Web Start applications or Untrusted Java applets, such as through a web service. CVSS 3.1 Base Score 5.9 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N).
Vulnerability Analysis
CVE-2026-91462 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.
Weakness Type
What is an Authorization Vulnerability?
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CVE-2026-91462 has been classified to as an Authorization vulnerability or weakness.
Products Associated with CVE-2026-91462
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Affected Versions
Oracle Corporation Oracle Java SE:- Version 8u503 is affected.
- Version 8u503-perf is affected.
- Version 11.0.32.1 is affected.
- Version 17.0.20.1 is affected.
- Version 21.0.12.1 is affected.
- Version 25.0.4.1 is affected.
- Version 27 is affected.
- Version 17.0.20.1 is affected.
- Version 21.0.12.1 is affected.
- Version 21.3.19.1.1 is affected.