CVE-2026-21100 SystemUI - Broken Access Control

SystemUI prior to SMR Sep-2026 Release 1 contains an improper access control vulnerability caused by insufficient restrictions, letting local attackers launch arbitrary activities, exploit requires local access.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.09% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
9 September 2026
Updated
15 October 2026
Weakness
CWE-284

Vendor fix

Update to SMR Sep-2026 Release 1 or later.

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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