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ChangelogLiteSpeed Enterprise

Web Server releases.

Key highlights from the LiteSpeed Web Server Enterprise release history. Upgrade in place with zero downtime.

LiteSpeed Web Server
Changelog

Release Log

LSWS 6.4.0 RC2Sep 17, 2026
  • SECURITY Further lock down lscgid.
  • SECURITY Enhance lscgid request authentication and validation.
  • SECURITY Apply stronger validation of internal redirect URL.
  • SECURITY Block important internal use environment variables for .htaccess.
  • NEW FEATURE Add JSON request body processing for mod_security engine.
  • NEW FEATURE Add ctl:ruleRemoveTargetById and ctl:ruleRemoveTargetByTag support for mod_security engine.
  • NEW FEATURE Enable post-quantum cryptography key exchange.
  • BUGFIX Address Anubis handling corner cases.
  • BUGFIX Include all bug fixes applied to 6.3.x releases.
LSWS 6.4.0 RC1Aug 13, 2026
  • IMPROVEMENT Support for multiple remote ACL URLs.
  • NEW FEATURE Add Anubis proof-of-work support.
  • NEW FEATURE Add ALTCHA CAPTCHA support.
  • NEW FEATURE Add Zstandard compression support.
  • NEW FEATURE Add background cache refresh support.
  • NEW FEATURE Add new UI for WebAdmin management console.
  • NEW FEATURE Strengthen HTTP/2 and HTTP/3 resource abuse protection.
  • BUGFIX Include all bug fixes applied to 6.3.x releases.
  • BUGFIX Allow \ in query string for HTTP/2 and HTTP/3 request headers.
  • BUGFIX Address another HTTP/2 request body length corner case that caused 400 status codes from proxy backends.
  • BUGFIX Address an issue in Anubis sub-request handling.
  • BUGFIX Address an Anubis configuration issue.
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