CVE-2026-44304
High
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.
SeverityHigh
CVSS8.1
Exploit probability—
ProductLemur
PublishedMay 12, 2026
First seenMay 12, 2026
Weakness typeCWE-90CWE-90
How to fix
Update
- lemur1.9.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| lemurPyPI | v < 1.9.0 | 1.9.0 |
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