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CVE-2024-35239

LOW

CVE-2024-35239 is a low-severity (CVSS 2.7) Cross-site Scripting (XSS) vulnerability in umbraco umbraco forms. O3 Security detects and blocks CVE-2024-35239 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

Umbraco Commerce is an open source dotnet web forms solution. In affected versions an authenticated user that has access to edit Forms may inject unsafe code into Forms components.…

Published
May 28, 2024
Updated
Jun 17, 2026
Affected
0 pkgs
Patched
None yet
Exploits
None indexed

Description

Umbraco Commerce is an open source dotnet web forms solution. In affected versions an authenticated user that has access to edit Forms may inject unsafe code into Forms components. This issue can be mitigated by configuring TitleAndDescription:AllowUnsafeHtmlRendering after upgrading to one of the patched versions (13.0.1, 12.2.2, 10.5.3, 8.13.13).

Affected Products

1 product · 4 configurations
Application
umbraco formsumbraco
≥ 13.0.0 && < 13.0.1
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every umbraco umbraco forms deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

  2. Fix

    Apply the umbraco umbraco forms security patch or hotfix for CVE-2024-35239 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

  4. How O3 protects you

    O3 detects and blocks CVE-2024-35239 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2024-35239. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Umbraco Commerce is an open source dotnet web forms solution. In affected versions an authenticated user that has access to edit Forms may inject unsafe code into Forms components. This issue can be mitigated by configuring TitleAndDescription:AllowUnsafeHtmlRendering after upgrading to one of the patched versions (13.0.1, 12.2.2, 10.5.3, 8.13.13).
O3 Security · Runtime Protection

Is CVE-2024-35239 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2024-35239 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.