CVE-2026-105869 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 MultiRolesTokenAuthorizationProvider trusting unverified JWT claims when anonymousUserRole fallback is enabled, letting unauthenticated clients gain arbitrary roles including super-user, exploit requires anonymousUserRole setting enabled with fallback allowed.

CVSS base score 9.2 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not 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:N/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-347

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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