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Medium
2026-08-07
ConfigServer Security & Firewall (CSF) 16.20-1 — cPanel & WHM Update
cPanel
CSF
Bug fixes Fixed regex.custom.pm custom rules silently failing to match log lines (CPANEL-53173). Fixed csf -cf $file no longer retaining newlines in the file (CPANEL-52801). For a full list of changes, read the ConfigServer Security & Firewall (CSF) change log.
Affected Versions
16.20-1
Bug fixes Fixed regex.custom.pm custom rules silently failing to match log lines (CPANEL-53173). Fixed csf -cf $file no longer retaining newlines in the file (CPANEL-52801). For a full list of changes, read the ConfigServer Security & Firewall (CSF) change log.
How to Apply the Fix
Update the affected packages on your server to the patched release, then restart the relevant services.
sudo /scripts/upcp --forceCheck your system for vulnerabilities
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