Formie: Pre-authenticated server-side template injection in Hidden fields

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Summary

CVECVE-2026-45697
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-29 20:16:27 UTC
Updated2026-05-29 20:21:38 UTC
DescriptionFormie is a Craft CMS plugin for creating forms. Prior to 2.2.20 and 3.1.24, 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). This vulnerability is fixed in 2.2.20 and 3.1.24.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-94 | CWE-693 | CWE-1336 | CWE-94 CWE-94: Improper Control of Generation of Code ('Code Injection') | CWE-693 CWE-693: Protection Mechanism Failure | CWE-1336 CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Verbb Formie affected < 2.2.20 Not specified
CNA Verbb Formie affected >= 3.0.0-beta.1, < 3.1.24 Not specified

References

ReferenceSourceLinkTags
github.com/verbb/formie/security/advisories/GHSA-x7m9-mwc2-g6w2 [email protected] github.com
github.com/verbb/formie/commit/f690d5623163ce2a95da305238d6367575486ee3 [email protected] github.com
github.com/verbb/formie/releases/tag/2.2.20 [email protected] github.com
github.com/verbb/formie/releases/tag/3.1.24 [email protected] github.com
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