---
title: "CVE-2026-105937: Apache Pulsar - Broken Access Control"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-105937/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-105937)

## 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](https://cwe.mitre.org/data/definitions/862.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-105937](https://nvd.nist.gov/vuln/detail/CVE-2026-105937)
- [https://lists.apache.org/thread.html/80foc311bwn839skc1p7fh89pgsrhyoj](https://lists.apache.org/thread.html/80foc311bwn839skc1p7fh89pgsrhyoj)
- [https://pulsar.apache.org/security/CVE-2026-105937/](https://pulsar.apache.org/security/CVE-2026-105937/)

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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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