CVE-2026-44304

Lemur: LDAP Filter Injection enables post-authentication privilege escalation

HIGH 8.1EPSS 0.3%

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.

Affected: Netflix · lemur
CVSS v3.1 GITHUB: 8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS: 0.29% chance of exploitation in the next 30 days, 20th percentile
Published: 2026-05-12
Updated: 2026-05-14

Proof-of-concept exploits (1)

advisories/GHSA-3r34-vq8m-39gh

References

CVE Record
NVD entry