CVE-2026-91484 Oracle Java SE - Broken Access Control

Oracle Java SE 8u503 and 8u503-perf contain a broken access control vulnerability caused by sandbox bypass in Java plugin, letting low privileged logged-in attackers modify or access critical data, exploit requires running untrusted code in sandboxed Java Web Start or applets.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Data Tampering, Information Disclosure
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Published
20 October 2026
Updated
21 October 2026

Vendor fix

Update to the latest available version beyond 8u503.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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