CVE-2026-105942 Apache Pulsar - Authorization Bypass

Apache Pulsar 2.8.1 < 4.0.14 and 4.1.0 < 4.2.5 contain an authorization bypass caused by improper authorization checks of proxy roles and original principals in broker and admin REST API, letting attackers perform unauthorized tenant admin operations, exploit requires proxy role with tenant admin or superuser privileges.

CVSS base score 7.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Authorization Bypass
Impact
Broken Access Control
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/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-863

Vendor fix

Upgrade to Apache Pulsar 4.0.14, 4.2.5 or later versions.

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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