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[Security] Lumo HtmlPreviewPanel message listener missing origin/source check - UI spoofing

Status: Open.

#524 In ProtonMail/WebClients;

· Ra-inskyy opened on Aug 1, 2026

[Security] SSO token + UID posted to window.opener without targetOrigin (session takeover)

Status: Open.

#522 In ProtonMail/WebClients;

· Ra-inskyy opened on Aug 1, 2026

[Security] CSS url() in <style> tags survives email sanitization - open tracking + IP leak bypassing image proxy

Status: Open.

#523 In ProtonMail/WebClients;

· Ra-inskyy opened on Aug 1, 2026

Rendering and Layout Issues with Forwarded Emails (e.g., from GMX), Am I the only one?

Status: Open.

#521 In ProtonMail/WebClients;

· Jakob-Schn opened on Jul 19, 2026

Question about Spanish localization (es-ES vs es-419)

Status: Open.

#519 In ProtonMail/WebClients;

· Munetios opened on Jul 19, 2026

Autofill does not detect Authentik login fields (inputs inside shadow DOM)

Status: Open.

#516 In ProtonMail/WebClients;

· arclabch opened on Jun 22, 2026

[Linux] GPU process crashes on startup (exit_code=11) with AMD + Mesa on Debian 12 — window never shown, --disable-gpu as workaround

Status: Open.

#514 In ProtonMail/WebClients;

· ghostintheshell-192 opened on Jun 13, 2026

Shared calendar ICS export: line folding sometimes consumes a content space (RFC 5545), varying between requests

Status: Open.

#513 In ProtonMail/WebClients;

· ghxm opened on Jun 12, 2026

Is local installation supported for external contributors?

Status: Open.

#510 In ProtonMail/WebClients;

· zecka opened on Jun 2, 2026

Extensibility of the docs-editor collaboration layer for non-linear document models

Status: Open.

#508 In ProtonMail/WebClients;

· kelian-4 opened on May 29, 2026

Feature - display more labels on emails (Improperly closed issues.)

Status: Open.

#507 In ProtonMail/WebClients;

· RheaAyase opened on May 27, 2026

[Enhancement] Offer IMAP, without Bridge.

Status: Open.

#506 In ProtonMail/WebClients;

· roke-julian-lockhart opened on May 24, 2026