[QTBUG-103778] [REG 5.15 -> 6.2] ERR_NETWORK_ACCESS_DENIED when clicking link from local page - Qt Bug Tracker

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Details

Type: Bug
Status: Closed
Priority: P1: Critical
Resolution: Done
Affects Version/s: 6.2.4, 6.3.0
Fix Version/s: 6.2.5, 6.3.1, 6.4.0 Beta1
Component/s: WebEngine
Labels:
None

Commits:
2ba1f04b45 (qt/qtwebengine/dev) cdd438c3aa (qt/qtwebengine/6.2) 8d0bd4b1a1 (qt/qtwebengine/6.3) 8d0bd4b1a1 (qt/qtwebengine/6.3.1) 8d0bd4b1a1 (qt/tqtc-qtwebengine/6.3.1) 2ba1f04b45 (qt/qtwebengine/6.4) 2ba1f04b45 (qt/tqtc-qtwebengine/6.4)

Description

With e.g. this HTML page:

<!doctype html>
<html>
    <body>
        <a href="https://qt.io">Qt</a>
    </body>
</html>

saved to a test.html, clicking the link with QtWebEngine 6.2 causes the load to be blocked with ERR_NETWORK_ACCESS_DENIED. This can e.g. be reproduced in simplebrowser.

Setting QWebEngineSettings::LocalContentCanAccessRemoteUrls to true (false by default) fixes things, but that seems unexpected: An user clicking links isn't the local content accessing a remote URL, it's just the user following a link (and probably something common, certainly working fine in e.g. Chromium). It also means that the page can now load any remote content, which seems problematic security-wise.

Possibly related: Improve local scheme access rules (Ieb24da12) · Gerrit Code Review