CVE-2026-91403 Oracle Java SE & GraalVM - Broken Access Control

Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition [affected versions: Java SE 8u511, 8u511-perf, 11.0.33, 17.0.21, 21.0.13, 25.0.5, 27.0.1; GraalVM for JDK 17.0.21, 21.0.13; GraalVM Enterprise Edition 21.3.20] contain an unauthorized data access and modification vulnerability caused by insecure API handling in JSSE component, letting unauthenticated network attackers create, delete, or modify critical data, exploit requires network access without authentication.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

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

Vendor fix

Update to the latest available versions of Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition.

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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