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Vulnerability · Published Oct 20, 2026 · Assigned by oracle

CVE-2026-91484

High 7.5

In plain English

A high-severity improper access control in Oracle Java SE from Oracle Corporation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.1%top 98.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Vulnerability in Oracle Java SE (component: Java plugin). Supported versions that are affected are Oracle Java SE: 8u503 and 8u503-perf. Difficult to exploit vulnerability allows low privileged attacker with logon to the infrastructure where Oracle Java SE executes to compromise Oracle Java SE. While the vulnerability is in Oracle Java SE, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Java SE accessible data as well as unauthorized access to critical data or complete access to all Oracle Java SE accessible data. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 7.5 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N).

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Ubuntu:22.04:LTSopenjdk-17no fix listedUBUNTU-CVE-2026-91484
Ubuntu:24.04:LTSopenjdk-17no fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.04:LTSopenjdk-17no fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.10openjdk-17no fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.04:LTSopenjdk-17-cracno fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.10openjdk-17-cracno fix listedUBUNTU-CVE-2026-91484
Ubuntu:22.04:LTSopenjdk-18no fix listedUBUNTU-CVE-2026-91484
Ubuntu:22.04:LTSopenjdk-21no fix listedUBUNTU-CVE-2026-91484
Ubuntu:24.04:LTSopenjdk-21no fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.04:LTSopenjdk-21no fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.10openjdk-21no fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.04:LTSopenjdk-21-cracno fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.10openjdk-21-cracno fix listedUBUNTU-CVE-2026-91484
Ubuntu:22.04:LTSopenjdk-25no fix listedUBUNTU-CVE-2026-91484
Ubuntu:24.04:LTSopenjdk-25no fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.04:LTSopenjdk-25no fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.10openjdk-25no fix listedUBUNTU-CVE-2026-91484
Ubuntu:22.04:LTSopenjdk-8no fix listedUBUNTU-CVE-2026-91484
Ubuntu:24.04:LTSopenjdk-8no fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.04:LTSopenjdk-8no fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.10openjdk-8no fix listedUBUNTU-CVE-2026-91484
Ubuntu:22.04:LTSopenjdk-ltsno fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.04:LTSopenjdk-ltsno fix listedUBUNTU-CVE-2026-91484
Ubuntu:26.10openjdk-ltsno fix listedUBUNTU-CVE-2026-91484

Affected products (as reported)

VendorProductVersions
Oracle Corporation Oracle Java SE 8u5038u503-perf

Weakness: CWE-284 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

References