---
title: "CVE-2026-23906: Apache Druid Vulnerable to Authentication Bypass"
url: https://erroneo.us/security/cve/CVE-2026-23906/
description: "CVE-2026-23906 (org.apache.druid.extensions:druid-basic-security (Maven)): Affected Products and Versions Apache Druid Affected Versions: 0.17.0 through…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-02-10
date_modified: 2026-02-12
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-23906"
kev: false
cvss: 9.3
epss: 0.01134
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-23906: Apache Druid Vulnerable to Authentication Bypass

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.1% , percentile 66: FIRST’s model estimates a 1.1% chance of exploitation activity in the next 30 days, higher than 66% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes org.apache.druid.extensions:druid-basic-security (Maven) >= 0.17.0, < 36.0.0, fixed in 36.0.0 . Check your lockfile, including transitive dependencies.

## What it is

Affected Products and Versions Apache Druid Affected Versions: 0.17.0 through 35.x (all versions prior to 36.0.0) Prerequisites: druid-basic-security extension enabled LDAP authenticator configured Underlying LDAP server permits anonymous bind Vulnerability Description An authentication bypass vulnerability exists in Apache Druid when using the druid-basic-security extension with LDAP authentication. If the underlying LDAP server is configured to allow anonymous binds, an attacker can bypass authentication by providing an existing username with an empty password. This allows unauthorized access to otherwise restricted Druid resources without valid credentials. The vulnerability stems from improper validation of LDAP authentication responses when anonymous binds are permitted, effectively treating anonymous bind success as valid user authentication. Impact A remote, unauthenticated attacker can: Gain unauthorized access to the Apache Druid cluster Access sensitive data stored in Druid datasources Execute queries and potentially manipulate data Access administrative interfaces if the bypassed account has elevated privileges Completely compromise the confidentiality, integrity, and availability of the Druid deployment Mitigation Immediate Mitigation (No Druid Upgrade Required): Disable anonymous bind on your LDAP server. This prevents the vulnerability from being exploitable and is the recommended immediate action. Resolution Upgrade Apache Druid to version 36.0.0 or later, which includes fixes to properly reject anonymous LDAP bind attempts.

## Affected packages

- Maven `org.apache.druid.extensions:druid-basic-security` >= 0.17.0, < 36.0.0 → fixed: 36.0.0

## Affected products (CVE record)

- Apache Software Foundation Apache Druid: 0.17.0 < 36.0.0

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.13% probability of exploitation activity in the next 30 days; percentile 66.

## Sources

- [lists.apache.org](https://lists.apache.org/thread/2x9rv3kv6t1p577lvq4z0rl0zlt9g4sr)
- [GitHub Advisory GHSA-q672-hfc7-g833](https://github.com/advisories/GHSA-q672-hfc7-g833)
- [CVE.org record CVE-2026-23906](https://www.cve.org/CVERecord?id=CVE-2026-23906)
- [NVD entry CVE-2026-23906](https://nvd.nist.gov/vuln/detail/CVE-2026-23906)
- [openwall.com](http://www.openwall.com/lists/oss-security/2026/02/09/5)

---
Source page: https://erroneo.us/security/cve/CVE-2026-23906/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt