Version 8.13.4 (Maintenance Release)
Maintenance

    WHMCS-25235 — Undisclosed Security Fix
    WHMCS-25253 — Undisclosed Security Fix
    WHMCS-25271 — Add validation Improvements in Admin Area
    WHMCS-25272 — Undisclosed Security Fix
    WHMCS-26073 — Improved encryption method for sensitive data storage
    WHMCS-26075 — Increased randomness of guest ticket access key generation
    WHMCS-26189 — Undisclosed Security Fix

Modules

    WHMCS-26056 — Undisclosed Security Fix
    WHMCS-26058 — Undisclosed Security Fix
    WHMCS-26060 — Undisclosed Security Fix
    WHMCS-26061 — Undisclosed Security Fix
    WHMCS-26063 — Undisclosed Security Fix
    WHMCS-26066 — Undisclosed Security Fix
    WHMCS-26072 — Undisclosed Security Fix
    WHMCS-26074 — Undisclosed Security Fix
    WHMCS-26079 — Undisclosed Security Fix
    WHMCS-26145 — Remove Asiapay, Gate2shop, Inpay & Paypoint from distribution
    WHMCS-26261 — Improve security around Reports
	
Version 8.13.3 (Maintenance)
Maintenance

    WHMCS-26041 - Security Fix for CVE-2026-2920
	
Version 8.13.2 (Maintenance Release)
Maintenance
We are limiting technical details on these changes to protect users who may not yet have upgraded.

    WHMCS-25506 — Undisclosed Security Fix
    WHMCS-25507 — Undisclosed Security Fix
    WHMCS-22710 — Undisclosed Security Fix
    WHMCS-25508 — Improved input field Validation in Admin Area
	
Version 8.13.1 (Maintenance)
Maintenance
We are limiting technical details on these changes to protect users who may not yet have upgraded.

    WHMCS-18936 — Prevent error when sending email from custom email template with bad attachment reference
    WHMCS-19766 — Disabling auto renewal for a domain in the admin area does not cancel the renewal invoice
    WHMCS-22025 — Clarify Ioncube Loader Minimum version for PHP 8.3
    WHMCS-22090 — Improve Activity Log entry for Admin-initiated User password change
    WHMCS-22228 — Layout changes on Client Area homepage after switching the theme (Also known as: WHMCS-22280)
    WHMCS-22233 — Improve formatting for invoice modification log entries
    WHMCS-22245 — Improve CSS for MarketConnect DigiCert landing page
    WHMCS-22289 — Honour parent theme definition for captcha.tpl on Login as Owner link
    WHMCS-22304 — Correct regression for target opening of custom module actions (styled as links) in clientarea sidebar
    WHMCS-22308 — Ensure ticket scheduled actions can be updated or cancelled when language is not set to English
    WHMCS-22450 — Improve visual responsiveness for SocialBee MarketConnect landing page
    WHMCS-22456 — Correct alignment of Admin Global Warning text
    WHMCS-22457 — Correct regression for displaying embedded videos in Knowledgebase articles
    WHMCS-19435 — Undisclosed Security Fix
    WHMCS-19947 — Undisclosed Security Fix
    WHMCS-19950 — Undisclosed Security Fix
    WHMCS-19952 — Undisclosed Security Fix
    WHMCS-19953 — Undisclosed Security Fix
    WHMCS-19954 — Undisclosed Security Fix
    WHMCS-19955 — Undisclosed Security Fix
    WHMCS-19957 — Undisclosed Security Fix
    WHMCS-19958 — Undisclosed Security Fix
    WHMCS-19959 — Undisclosed Security Fix
    WHMCS-19960 — Undisclosed Security Fix
    WHMCS-19967 — Undisclosed Security Fix
    WHMCS-19981 — Undisclosed Security Fix
    WHMCS-19983 — Undisclosed Security Fix
    WHMCS-19984 — Undisclosed Security Fix
    WHMCS-19987 — Undisclosed Security Fix
    WHMCS-19992 — Undisclosed Security Fix
    WHMCS-20029 — Undisclosed Security Fix
    WHMCS-20064 — Undisclosed Security Fix
    WHMCS-20066 — Undisclosed Security Fix
    WHMCS-21726 — Undisclosed Security Fix
    WHMCS-21729 — Undisclosed Security Fix
    WHMCS-21763 — Undisclosed Security Fix
    WHMCS-21765 — Undisclosed Security Fix
    WHMCS-21766 — Undisclosed Security Fix
    WHMCS-21768 — Undisclosed Security Fix
    WHMCS-21769 — Undisclosed Security Fix
    WHMCS-21862 — Undisclosed Security Fix
    WHMCS-21884 — Undisclosed Security Fix
    WHMCS-21998 — Undisclosed Security Fix
    WHMCS-22041 — Undisclosed Security Fix

Modules

    WHMCS-21375 — Ensure only partial payment amount is capture when appropriate for invoices paid by PayPal Payments (Also known as: MODULE-8180)