CVE-2025-47280
MEDIUMCVE-2025-47280 is a medium-severity (CVSS 6.1) CWE-116 vulnerability in umbraco umbraco forms. O3 Security detects and blocks CVE-2025-47280 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.
Umbraco Forms is a form builder that integrates with the Umbraco content management system. Starting in the 7.x branch and prior to versions 13.4.2 and 15.1.2, the 'Send email' workflow…
Description
Umbraco Forms is a form builder that integrates with the Umbraco content management system. Starting in the 7.x branch and prior to versions 13.4.2 and 15.1.2, the 'Send email' workflow does not HTML encode the user-provided field values in the sent email message, making any form with this workflow configured vulnerable, as it allows sending the message from a trusted system and address, potentially bypassing spam and email client security systems. This issue affects all (supported) versions Umbraco Forms and is patched in 13.4.2 and 15.1.2. Unpatched or unsupported versions can workaround this issue by using the Send email with template (Razor) workflow instead or writing a custom workflow type. To avoid accidentally using the vulnerable workflow again, the SendEmail workflow type can be removed using a composer available in the GitHub Security Advisory for this vulnerability.
Affected Products
umbraco formsumbracoDetection & mitigation playbook
Vendor / applianceDetect
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.
Fix
Apply the umbraco umbraco forms security patch or hotfix for CVE-2025-47280 on the affected version, following the vendor advisory for your exact build.
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.
How O3 protects you
O3 detects and blocks CVE-2025-47280 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-2025-47280. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2025-47280 being exploited in your environment?
O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2025-47280 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.