PT-2026-38300 · Lemur · Lemur

Published 2026-05-06 · Updated 2026-05-14 · CVE-2026-44304

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions Lemur versions prior to 1.9.0

Description The 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 variable in the '/auth/login' endpoint to manipulate group membership queries. This allows the user to escalate their privileges to administrator, gaining unauthorized access to all certificates, private keys via the '/certificates//key' endpoint, and CA configurations, as well as the ability to issue certificates under any authority. The issue occurs within the bind() function.

Recommendations Update to version 1.9.0. As a temporary workaround, restrict access to the LDAP authentication module or the '/auth/login' endpoint to trusted users only.

Exploit

Fix

LPE

Weakness Enumeration

CWE-90

Related Identifiers

CVE-2026-44304

GHSA-3R34-VQ8M-39GH

Affected Products

Lemur

References · 8

• 🔥 https://github.com/Netflix/lemur/security/advisories/GHSA-3r34-vq8m-39gh · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-44304 · Security Note
• https://osv.dev/vulnerability/GHSA-3r34-vq8m-39gh · Vendor Advisory
• https://github.com/Netflix/lemur/releases/tag/v1.9.0 · Note
• https://github.com/Netflix/lemur · Note
• https://t.me/cveNotify/163445 · Telegram Post
• https://t.me/CVEtracker/53561 · Telegram Post
• https://twitter.com/CVEnew/status/2054323981386428455 · Twitter Post