CVE-2026-52889
CriticalCVSS 9.8Exploitation Probability (EPSS)
Elevated risk50th percentile - higher than 50% of all known CVEs
Summary
Formie, a Craft CMS plugin for creating forms, before version 3.1.27 passes request-derived Hidden field defaults (e.g., User Agent, URL, query parameters) to Craft's Twig rendering layer. An unauthenticated attacker can place Twig syntax in these values, leading to server-side template evaluation (SSTI), potentially resulting in information disclosure, application state modification, or remote code execution.
Risk Assessment
An attacker can exploit the vulnerability to obtain sensitive information, modify application state, or achieve remote code execution, potentially leading to full site compromise.
Recommendation
Update Formie to version 3.1.27 or later. Review public forms for Hidden fields and restrict passing request data to Twig.
Other vulnerabilities in Formie
See all- CVE-2026-45697Critical
Formie, a Craft CMS plugin, prior to versions 2.2.20 and 3.1.24 allows unauthenticated users to submit crafted values into Hidden fields that are evaluated as Twig during submission handling. This can lead to serious compromise of the Craft site.
- CVE-2026-76089High
In the Formie plugin for Craft CMS prior to 2.2.23 and 3.1.31, the formie/sent-notifications/get-resend-modal-content action in SentNotificationsController::actionGetResendModalContent accepts a request-supplied notification ID without permission or object-level authorization checks. Any authenticated user able to invoke the action can enumerate notification IDs and read recipient headers and complete HTML email bodies containing submitted form data, even without the sent-notification viewing permission.
- CVE-2026-76087High
In the Formie plugin for Craft CMS prior to 2.2.23 and 3.1.31, the anonymous formie/submissions/submit action in SubmissionsController::actionSubmit trusts a client-supplied submissionId when loading an incomplete submission without session binding, ownership validation, or a valid submissionEditToken. An unauthenticated attacker can enumerate sequential IDs and overwrite or hijack another user's in-progress multi-page or save-for-later submission, and the modified data can be persisted and forwarded through notifications or integrations when the submission is completed.
- CVE-2026-76086High
In the Formie plugin for Craft CMS prior to 2.2.23 and 3.1.31, the formie/integrations/form-settings control panel action in IntegrationsController::actionFormSettings is reachable without the required form integration permissions and passes request-supplied settings to a configured integration. An authenticated attacker can replace outbound host properties such as apiUrl while the server uses stored API keys or OAuth tokens, causing non-blind server-side requests to an attacker-controlled or internal host and returning the remote response.
- CVE-2026-47266High
The Formie plugin for Craft CMS before versions 2.2.21 and 3.1.26 allowed unauthenticated users to modify existing submissions by posting a known or guessed submission ID to the formie/submissions/save-submission endpoint.
Original NVD description (English source)
Formie is a Craft CMS plugin for creating forms. Prior to 3.1.27, Formie can pass request-derived Hidden field defaults such as HTTP User Agent, Referer URL, Current URL, Current URL without Query String, Query Parameter, and Cookie Value to Craft's Twig rendering layer during front-end form rendering. An unauthenticated attacker can place Twig syntax in one of these request-controlled inputs when a public form contains an affected Hidden field. Hidden::getFrontEndInputOptions() then assigns the value to defaultValue and calls renderString, causing server-side template evaluation rather than treating the request data as a plain string. Depending on the Craft site configuration and available Twig capabilities, exploitation can disclose sensitive information, modify application state, or achieve remote code execution. This issue is fixed in version 3.1.27.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS