CVE-2026-105937 Apache Pulsar - Broken Access Control

Apache Pulsar 3.0.0 < 4.0.14 and 4.1.0 < 4.2.5 contain a broken access control vulnerability caused by improper authorization checks on shadow topic creation and updates, letting authenticated tenant admins access and manipulate data from other tenants' topics, exploit requires tenant admin privileges on own tenant.

CVSS base score 8.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Information Disclosure, Data Tampering
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
21 October 2026
Updated
22 October 2026
Weakness
CWE-862

Vendor fix

Upgrade to Apache Pulsar 4.0.14, 4.2.5 or later and disable shadow topics by default or enable with strict authorization controls.

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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