---
title: "CVE-2026-105942: Apache Pulsar - Authorization Bypass"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-105942/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-105942)

## 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](https://cwe.mitre.org/data/definitions/863.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-105942](https://nvd.nist.gov/vuln/detail/CVE-2026-105942)
- [https://lists.apache.org/thread.html/4jmsbztr1fwws5fmxk36q5326wvjlwx4](https://lists.apache.org/thread.html/4jmsbztr1fwws5fmxk36q5326wvjlwx4)
- [https://pulsar.apache.org/security/CVE-2026-105942/](https://pulsar.apache.org/security/CVE-2026-105942/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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