2.4.6

This release includes broad security hardening for API permissions, untrusted input, generated links, and browser actions.

Breaking changes

• Invoice email notifications: Remove the legacy per-invoice notificationEmail option; use merchant-controlled email rules instead (#7672) @NicolasDorier

New features

• Maintenance: Show live output, progress, and failure details while changing domains, restarting services, cleaning Docker images, or updating BTCPay Server (#7720) @NicolasDorier
• Plugins: Show persistent diagnostics for plugins automatically disabled after startup or runtime failures (#7708) @NicolasDorier

Improvements

• Wallet: Clarify transaction filters, import and export actions, responsive layout, and fee-bump actions (#7470) @dstrukt
• QR codes: Add a white margin to improve scanning in dark mode (#7735) @NicolasDorier
• Checkout settings: Show readable payment method names instead of internal IDs (#7676) @Psycarlo
• Invoices: Load recent invoice lists significantly faster on large servers (#7707) @NicolasDorier
• Bitcoin fees: Prefer fee estimates from the connected Bitcoin Core node (#7682) @NicolasDorier
• Generated links: Consistently use the configured public server URL (#7661 #7662 #7663) @NicolasDorier

Fixes

• Runtime security: Update .NET and the Ubuntu container trust store to fix the Brotli decoder vulnerability (CVE-2026-111497) and distrust certificates affected by the eMudhra CA key compromise @NicolasDorier
• API Keys: Prevent server errors when API key permission forms are incomplete (#7733) @NicolasDorier
• Basic authentication: Allow Greenfield API access when account passwords contain colons (#7736) @NicolasDorier
• Public forms: Keep Crowdfund, Point of Sale, and Payment Request forms on their original route when validation fails (#7716) @NicolasDorier
• Lightning payouts: Complete LNDHub-on-LNbits payouts correctly, retain pending payment proofs when lookups return no result, and round LNURL payouts down to whole satoshis (#7653 #7679 #7703) @NicolasDorier @shin4141
• LNURL: Preserve URI casing in payment and authentication QR codes, and require settled payments during verification (#7681) @NicolasDorier
• Email Rules: Limit rendered messages to 100 recipients and handle empty recipient placeholders without interrupting other rules (#7690 #7718) @Kukks @comwanga
• Subscriptions: Prevent new subscriptions from taking control of existing accounts, protect administrators from subscriber lockouts, and make concurrent credit updates atomic (#7654 #7660 #7700) @NicolasDorier @Kukks
• Templates: Preserve unsupported placeholders in configured URLs, descriptions, and labels (#7717) @NicolasDorier
• Security hardening: Strengthen store permissions, browser actions, external URLs, Payjoin requests, and untrusted input across APIs, wallets, forms, subscriptions, webhooks, and apps (#7658 #7659 #7664 #7665 #7666 #7667 #7669 #7686 #7687 #7688 #7689 #7692 #7693 #7694 #7695 #7696 #7701 #7713 #7722 #7723) @NicolasDorier @Kukks
• HTML customization: Apply stricter sanitization to custom HTML and CSS, while preserving rich media for merchant-authored public app and payment descriptions (#7726) @NicolasDorier
• Authentication: Require protected POST requests for logout; direct links and bookmarks to /logout no longer sign users out (#7704) @NicolasDorier
• Redirect URLs: Accept only absolute HTTP or HTTPS redirect URLs in API key authorization and Greenfield or BitPay-compatible invoice requests (#7714 #7721 #7729) @NicolasDorier @tumutech
• API Keys: Keep restricted API keys within their granted store and user permission scope, including when the key owner is a server administrator (#7684) @Kukks

Thanks to @iaohkut, bitcoinbazar21 and Nikhil Agrawal for responsibly disclosing security issues fixed in this release.