CVE-2026-23906 is a critical authentication bypass vulnerability in Apache Druid versions 0.17.0 through 35.x, specifically when the druid-basic-security extension and LDAP authenticator are enabled, and the underlying LDAP server permits anonymous binds. An unauthenticated attacker can exploit this by providing an existing username with an empty password, gaining unauthorized access to the Druid cluster. This vulnerability carries a CVSS score of 9.8 (CRITICAL) due to its network attack vector, low complexity, and potential for complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered some community discussion and media coverage, indicating awareness. Organizations should immediately disable anonymous binds on their LDAP servers and upgrade Apache Druid to version 36.0.0 or later to mitigate this risk.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 0.17.0, < 36.0.0CPE matchmatch criteria | cpe:2.3:a:apache:druid:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.