Detections
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Oracle Java SE Critical Certificate Trust (CVE-2026-91403 Security Alert)

critical Nessus Plugin ID 371349

Synopsis

The remote host is affected by a vulnerability.

Description

The 8u511, 8u511-perf, 11.0.33, 17.0.21, 21.0.13, 25.0.5, or 27.0.1 versions of Java installed on the remote host are affected by a vulnerability as referenced in the CVE-2026-91403 Oracle Security Alert advisory.

 - Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JSSE). Supported versions that are affected are Oracle Java SE: 8u511, 8u511-perf, 11.0.33, 17.0.21, 21.0.13, 25.0.5, 27.0.1; Oracle GraalVM for JDK: 17.0.21 and 21.0.13; Oracle GraalVM Enterprise Edition:
 21.3.20. Easily exploitable 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 as well as unauthorized access to critical data or complete access to all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. (CVE-2026-91403)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Java SE 11.0.33.0.2, 17.0.21.0.2, 21.0.13.0.2, 25.0.5.0.2, or 27.0.1.0.2 as appropriate per the CVE-2026-91403 Oracle Security Alert advisory. For Java SE 8, apply the 8u511 b32 BPR available from My Oracle Support.

See Also

https://www.oracle.com/security-alerts/alert-cve-2026-91403.html

http://www.nessus.org/u?cd9bfc7d

Plugin Details

Severity: Critical

ID: 371349

File Name: oracle_java_CVE-2026-91403.nasl

Version: 1.1

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 10/23/2026

Updated: 10/23/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

Percentile: 98.17

CVSS v2

Risk Factor: High

Base Score: 9.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2026-91403

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Vulnerability Information

CPE: cpe:/a:oracle:jdk, cpe:/a:oracle:jre

Required KB Items: installed_sw/Java

Patch Publication Date: 10/21/2026

Vulnerability Publication Date: 10/21/2026

Reference Information

CVE: CVE-2026-91403