How severe is CVE-2026-44304?

CVE-2026-44304 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-44304 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-44304?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-44304 have an EU (EUVD) identifier?

Yes. CVE-2026-44304 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29864.

When was CVE-2026-44304 published?

CVE-2026-44304 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-44304

CVE-2026-44304 is a high-severity vulnerability with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-90.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29864
Weakness: CWE-90
Published: 2026-05-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-44304?: 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.
How severe is CVE-2026-44304?: CVE-2026-44304 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-44304 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-44304?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-44304 have an EU (EUVD) identifier?: Yes. CVE-2026-44304 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29864.
When was CVE-2026-44304 published?: CVE-2026-44304 was published on 2026-05-12 and last updated on 2026-06-17.

References

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

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