CVE-2026-44304

Lemur: LDAP Filter Injection enables post-authentication privilege escalation

State: Published
Severity: 8.1 High
Published: May 12, 2026
Updated: May 14, 2026
Reserved: May 5, 2026

Description

Lemur manages TLS certificate creation. Prior to 1.9.0, Lemur's LDAP authentication module (lemur/auth/ldap.py) constructs LDAP search filters using unsanitized user input via Python string interpolation. An authenticated LDAP user can inject LDAP filter metacharacters through the username field to manipulate group membership queries and escalate their privileges to administrator. This vulnerability is fixed in 1.9.0.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-90 Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

Affected Products

Product	Versions
lemurNetflix	< 1.9.0Affected

References

https://github.com/Netflix/lemur/security/advisories/GHSA-3r34-vq8m-39gh

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