CVE-2026-52889: critical vulnerability in verbb formie
Formie: Server-Side Template Injection in Formie Hidden field defaults
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.8epss 1.3%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
verbb · formieRelated CVEs — verbb formie
In the same product, most dangerous first.
CVE-2026-76086HIGHFormie: Integration form-settings action allows SSRF and exfiltration of stored integration credentialsEPSS 0.5%CVE-2026-45697CRITICALFormie: Pre-authenticated server-side template injection in Hidden fieldsEPSS 0.5%CVE-2026-76089HIGHFormie: Missing authorization on sent notification resend modal exposes submission PIIEPSS 0.4%CVE-2026-76087HIGHFormie: Unauthenticated users can overwrite incomplete submissions via submit actionEPSS 0.4%CVE-2026-47266HIGHFormie: Unauthenticated front-end submission editing can overwrite existing submissionsEPSS 0.3%CVE-2024-35191MEDIUMverbb/formie Server-Side Template Injection for variable-enabled settingsEPSS 0.3%