Formie: Pre-authenticated server-side template injection in Hidden fields — CVE-2026-45697

Summary

### Impact - Unauthenticated users could submit crafted values into Hidden fields (with Default value → Custom) that were evaluated as Twig during submission handling, which could lead to serious compromise of the Craft site (depending on template/sandbox behavior). - Sites with public Formie forms that include at least one Hidden field with that configuration. - No CP login for the reported chain. ### Patches -…

Product

composer: verbb/formie

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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