CVE-2026-82431 Apache Storm - Broken Access Control

Apache Storm < 3.1.0 contains a broken access control caused by improper evaluation of nimbus.groups when nimbus.users is empty in SimpleACLAuthorizer, letting authenticated operators bypass group restrictions and perform all user-level operations, exploit requires cluster access with authentication.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.39% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-863

Vendor fix

Upgrade to Apache Storm 3.1.0 or later where nimbus.groups is properly evaluated regardless of nimbus.users setting.

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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