Security: upgrade Next.js 16.2.4 -> 16.2.6 to patch CVE-2026-44578
(GHSA-c4j6-fc7j-m34r, CVSS 8.6, unauthenticated WebSocket-upgrade
SSRF on the built-in Node server) and eleven other May 2026
advisories bundled in the same release. next-intl patched for
GHSA-4c35-wcg5-mm9h prototype pollution in the experimental
precompile path. React/react-dom rolled forward to 19.2.6.
Fixes:
- bulk delete now honours the "delete to trash" setting instead of
always hard-deleting
- favicon repaints the base icon on zero unread so the badge clears
- Attachments from providers that stamp a Content-ID on every part
(e.g. Gmail) now show in the attachment panel; previously they were
silently filtered out as "inline" even when the HTML body never
cited their cid. The viewer now parses the body for actual cid:
references and treats only those attachments as inline (#58).
- Email-to-self no longer gets discarded as a duplicate by the
sender's own MTA. The send flow keeps the outgoing message in
Drafts during submission and uses EmailSubmission.onSuccessUpdate\
Email to move it to Sent only after SMTP has accepted it, so the
inbound delivery for self-send doesn't match a pre-existing
Message-ID in the account (#60).
Thanks @melges-morgen and @tamisoft for the reports.
Community PRs and targeted feature work. Highlights:
Features
- Archive now operates on the whole conversation, matching Gmail (#49)
- Russian and Ukrainian locales, full translation sets (#59 @VsevolodSauta)
- Custom favicon with unread badge painted over the base mail icon;
also fixes stale sidebar counters on JMAP push (#63 @jabiinfante)
- Optional domain-favicon avatars with a privacy-preserving proxy and
a freemail denylist so the same provider logo isn't shown for every
sender on a shared host (#22)
Fixes
- Print (Ctrl+P, button, menu) produces a clean single-column page for
plain text and HTML emails alike, with actions/reply panels hidden,
dark-mode overridden, and wide newsletters shrunk to fit A4
- Contacts now load past 500 entries by batching ContactCard/get to
the server's maxObjectsInGet (#45 @capitanroy, #46)
- Sieve filter destinations use the full Parent/Child folder path so
Stalwart can resolve them (#62 @travier)
- OIDC over plain HTTP shows a clear HTTPS-required banner instead of
throwing crypto.subtle is undefined (#23 @jothoma1)
- Missing contacts delete-confirm translation keys added to every
locale (only Dutch had them before)
- Favicon badge hook stopped tearing out Next.js's managed icon link,
fixing a parentNode-is-null crash on route changes
- Contact empty-state action buttons fit their container (#56)
- Print layout excludes sidebar/list (#55 @prastowoagungwidodo)
Docs
- README example for OAUTH_ONLY=true to disable Basic Auth (#61
@travier)
Infrastructure
- Container images also published under jmap-webmail:1 for major-tag
pinning (#57 @joelpurra, closes#54)
The plain-text email renderer escaped <, >, and & before building anchor
tags for linkified URLs, but did not escape " or '. A crafted URL
containing a quote broke out of the href attribute and could inject
event handlers into the rendered HTML. Affects both the single-email
viewer and the threaded conversation view.
Fix by extracting a shared plainTextToSafeHtml helper that escapes all
five HTML-significant characters in the correct order before
linkification. Both views route through it. Regression tests parse the
output and assert no event handler lands on the anchor element.
Reported privately by Linus Rath. Thank you for the responsible
disclosure.
Also bumps dependencies flagged by npm audit:
- Next.js 16.1.5 -> 16.2.4 (DoS in Server Components)
- next-intl 4.5.8 -> 4.9.1 (open redirect)
- DOMPurify 3.3.1 -> 3.4.0 (FORBID_TAGS bypass)
- picomatch, vite, brace-expansion resolve transitively
Also carries the Apache JAMES compose fix from the 1.4.0 cycle (explicit
text/plain type on textBody per RFC 8621 section 4.1.4) and the missing
email_viewer.send translation.
Release 1.4.1.
New features:
- Sandboxed iframe rendering for rich HTML emails (CSS isolation)
- Mobile bottom action bar (Reply, Archive, Delete, More)
- Long-press context menu with haptic feedback on touch devices
- Tag counts sidebar section with batch JMAP queries
- Empty folder for Junk/Trash with batch delete progress
- Extra-compact density option (28px desktop, 44px touch)
- SPF/DKIM/DMARC security tooltips with plain-language explanations
- Resizable sidebars with drag, touch, and keyboard support
- Expandable sender info panel in email viewer
- API retry with exponential backoff for transient JMAP failures
- OAuth-only mode (OAUTH_ONLY env var)
Improvements:
- CSS-first responsive layout (no blink on orientation change)
- Touch-friendly context menu submenus (tap-to-expand)
- Click-to-toggle more-actions dropdown (was hover-only)
- Wide HTML emails horizontally scrollable in iframe
- All 8 locales updated with new translation keys
Add opt-in SSO authentication alongside Basic Auth. OAuth endpoints are
auto-discovered via .well-known, with support for external IdPs
(Keycloak, Authentik) via configurable OAUTH_ISSUER_URL. Sessions
persist through httpOnly refresh token cookies with automatic renewal.
- Emails now include the identity display name in the From field so recipients
see "Name <email>" instead of bare "<email>"
- Primary identity (matching login username) is pre-selected in composer dropdown
Distinguish CORS-blocked requests from genuine network failures using
a no-cors probe, so users deploying via Docker see a specific message
pointing to their JMAP server's CORS settings instead of a misleading
"unable to reach the server" error.
Full calendar support via JMAP Calendars (RFC 8984):
- Event create/edit/delete with recurrence rules and reminders
- Multi-day event spanning, column-based overlap layout
- Locale-aware date formatting, first day of week and time format settings
- Real-time updates via push notifications
- ARIA accessibility, input validation, color sanitization
- Keyboard shortcuts, mobile touch targets, focus trap
- ICU pluralization for all 8 supported languages
- Address book with JMAP sync and local fallback (contacts CRUD,
search/filter, composer autocomplete, i18n for 8 languages)
- Fix email layout: remove horizontal scroll, left-side clipping,
and empty spaces from blocked external images in newsletters
- Update all dependencies to latest compatible versions
- Expand i18n from 3 to 8 languages (added ES, IT, DE, NL, PT)
- Upgrade Next.js to 16.1.6 for security patches
This release significantly expands internationalization support and adds comprehensive identity management features.
Internationalization (i18n):
- Add 5 new languages: Spanish, Italian, German, Dutch, Portuguese
- Expand from 3 to 8 total supported languages
- Redesign language switcher for better scalability (dropdown UI)
- Complete translations for all features across all languages
Identity Management:
- Multiple sender identities with per-identity signatures
- Sub-addressing support (user+tag@domain.com)
- Context-aware tag suggestions for sub-addresses
- Identity badges in email viewer and list
- Full CRUD operations for managing identities
Newsletter Management:
- RFC 2369 List-Unsubscribe support (one-click unsubscribe)
- HTTP and mailto unsubscribe methods
- Security validation prevents XSS attacks
- Two-step confirmation with persistent dismissal
Security & Accessibility:
- Dark mode email readability (intelligent color transformation)
- WCAG 2.0 Level AA color contrast compliance
- Comprehensive XSS prevention with validation utilities
- Unit test coverage for security-critical code (57 validation tests)
Testing:
- Add unit tests for validation utilities
- Add unit tests for email sanitization
- Add unit tests for color transformation
- Full test coverage for XSS attack vectors
- Add pagination support to search (previously limited to 50 results)
- Search now scoped to current mailbox/folder
- Support shared mailbox folders in search
- Display total results count (e.g., "50 of 1400 conversations")
- Add clear (X) button to search input
- Re-run search when changing folders during active search
- Remove unused sidebar screenshot
A modern, privacy-focused webmail client built with Next.js and the JMAP protocol.
Designed for Stalwart Mail Server.
Features:
- Full email operations (compose, reply, forward, threading)
- Real-time push notifications
- Dark/light theme support
- Mobile responsive design
- Keyboard shortcuts
- Drag-and-drop organization
- i18n (English/French)
- Security-first (external content blocked, HTML sanitization)
Matthieu MALVACHE
Rens Reinders