CVE-2026-421678.1HighCWE-89

CVE-2026-42167: ProFTPD mod_sql - Preauth User Backdoor

ProFTPD

Fixed in 1.3.9a · Affected: ProFTPD before 1.3.9a · Exploitation: check available, not yet exploited

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

7.4%probability of exploitation in the next 30 days

94th percentile

050100

Higher than 94% of scored CVEs

8.1HighCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

mod_sql in ProFTPD before 1.3.9a allows remote attackers to execute arbitrary code via a username, in scenarios where there is logging of USER requests with an expansion such as %U, and the SQL backend allows commands (e.g., COPY TO PROGRAM).

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

ProFTPD · ProFTPDfrom 1.3.7b before 1.3.9a

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Check available, not yet exploited. A public nuclei template can confirm it on a system you are authorised to test.
CISA KEV: Not listed
Public check: ProFTPD mod_sql - Preauth User Backdoor · nuclei template in projectdiscovery/nuclei-templates
Weakness: SQL Injection
Vendor: ProFTPD
Published: April 2026
Band: Check available, not yet exploited, April 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-42167 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.